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Use All 4 Quadrants of the Coordinate Plane
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 We’ll learn how to plot points in all four quadrants of the coordinate plane.
 We will also learn how to measure the lengths of LINES on the coordinate plane.
 And we'll see how this knowledge can help us go to an amusement park, plan a trip, and even design a board game!

Discussion Questions

Before VideoWhy does order matter when you use ordered pairs of numbers?ANSWER

The order is important because it provides one specific location in the coordinate plane.

Move 3 units to the right of the origin on the xaxis and up 4 units on the yaxis.

The origin is the point where the xaxis and yaxis intersect.

(0, 0)

0


After VideoDescribe how to locate the point (–9, 7) on the coordinate grid.ANSWER

Begin at the origin, move left 9 units on the xaxis, and then move up 7 units on the yaxis.
(–3, 5) and (6, 5)?
ANSWER
Graph the two points on a coordinate plane and count the number of units between the xcoordinates (add the absolute values), or subtract the smaller xcoordinate from the larger xcoordinate (6 – (–3) = 9).

(–1, 1)

A vertical line

28 square units



Vocabulary

Coordinate plane
DEFINE
A grid that contains two number lines that intersect at a right angle at 0 and divide the plane into four quadrants.

Origin
DEFINE
The point where the two axes of a coordinate grid intersect; the point is represented by the ordered pair (0, 0).

Ordered pair
DEFINE
The location of a point on a coordinate plane written as (x, y).

xaxis
DEFINE
The horizontal number line on a coordinate grid.

yaxis
DEFINE
The vertical number line on a coordinate grid.

xcoordinate
DEFINE
The first number in an ordered pair, which names the distance to the right or left from the origin along the xaxis.

ycoordinate
DEFINE
The second number in an ordered pair, which names the distance up or down from the origin along the yaxis.

Absolute value
DEFINE
The distance a number is from 0 on the number line.

Coordinate plane
DEFINE

Reading Material
Download as PDF Download PDF View as Separate PageTHE COORDINATE PLANE HAS 4 QUADRANTS.A number line goes on infinitely in both directions; so do the axes on a coordinate grid. Up until now, you only plotted points in the section of the coordinate plane where both x– and yvalues were positive. You can also plot points where either value (or both!) is negative.
To better understand using all 4 quadrants of the coordinate plane…
THE COORDINATE PLANE HAS 4 QUADRANTS. A number line goes on infinitely in both directions; so do the axes on a coordinate grid. Up until now, you only plotted points in the section of the coordinate plane where both x– and yvalues were positive. You can also plot points where either value (or both!) is negative. To better understand using all 4 quadrants of the coordinate plane…LET’S BREAK IT DOWN!
Expanding the coordinate grid.
An amusement park uses a coordinate grid to map out locations for rides. The coordinate grid shows new numbers now: the yaxis extends past 0 to the negative numbers, and so does the xaxis. There are now four sections, or quadrants, on the grid. Try this yourself: Identify the quadrant on the coordinate grid where you have plotted points before.
Expanding the coordinate grid. An amusement park uses a coordinate grid to map out locations for rides. The coordinate grid shows new numbers now: the yaxis extends past 0 to the negative numbers, and so does the xaxis. There are now four sections, or quadrants, on the grid. Try this yourself: Identify the quadrant on the coordinate grid where you have plotted points before.Plot points in all four quadrants in the coordinate grid.
The locations of four rides at the park are: Radical Rollercoaster (3, 4), Elevator Doom Drop (−3, 4), TiltAWhirl (−5, −4), and Raging Rapids Raft Adventure (2, −1). To locate the Radical Rollercoaster, start at the origin and go right 3 units on the xaxis to 3. Then move up 4 to the point (3, 4). To locate the Doom Drop Tower, move 3 units to the left of 0 on the xaxis to −3. Next, move up 4 units from 0 on the yaxis to 4. To locate the TiltAWhirl, move left from 0 on the xaxis 5 units and down 4 units below 0 on the yaxis to the point (−5, −4). To locate Raging Rapids, at point (2, −1), move 2 units to the right of 0 on the xaxis and 1 unit below 0 on the yaxis. Try this yourself: Describe how you would plot the Gift Shop at (−2, −2).
Plot points in all four quadrants in the coordinate grid. The locations of four rides at the park are: Radical Rollercoaster (3, 4), Elevator Doom Drop (−3, 4), TiltAWhirl (−5, −4), and Raging Rapids Raft Adventure (2, −1). To locate the Radical Rollercoaster, start at the origin and go right 3 units on the xaxis to 3. Then move up 4 to the point (3, 4). To locate the Doom Drop Tower, move 3 units to the left of 0 on the xaxis to −3. Next, move up 4 units from 0 on the yaxis to 4. To locate the TiltAWhirl, move left from 0 on the xaxis 5 units and down 4 units below 0 on the yaxis to the point (−5, −4). To locate Raging Rapids, at point (2, −1), move 2 units to the right of 0 on the xaxis and 1 unit below 0 on the yaxis. Try this yourself: Describe how you would plot the Gift Shop at (−2, −2).Draw and measure lines on the coordinate grid.
You need to find the distance between two locations on a city map. The pier is at (−10, 7) and the airport is at (10, 7). Both landmarks have the same ycoordinate, so they lie on a horizontal line. The distance is the number of units from one xcoordinate to the other. From −10 to 10 is 20 units. If each unit is 1 kilometer, the distance between these locations is 20 kilometers. You can also subtract the xcoordinates to find the distance: 1010=20. To find the distance from the pier at point (−10, 7) and City Hall at point (−10, −6), subtract the ycoordinates: 76 = 13. The Pier and City Hall are 13 kilometers apart. Try this yourself: What is the distance between the Art Museum at (4, −6) and the Hotel at (4, −2)?
Draw and measure lines on the coordinate grid. You need to find the distance between two locations on a city map. The pier is at (−10, 7) and the airport is at (10, 7). Both landmarks have the same ycoordinate, so they lie on a horizontal line. The distance is the number of units from one xcoordinate to the other. From −10 to 10 is 20 units. If each unit is 1 kilometer, the distance between these locations is 20 kilometers. You can also subtract the xcoordinates to find the distance: 1010=20. To find the distance from the pier at point (−10, 7) and City Hall at point (−10, −6), subtract the ycoordinates: 76 = 13. The Pier and City Hall are 13 kilometers apart. Try this yourself: What is the distance between the Art Museum at (4, −6) and the Hotel at (4, −2)?Find the perimeter of a shape using coordinates.
You’ve designed a board game on a coordinate grid on the computer. The gameboard is a rectangle with vertices at (8, 10), (8, −7), (−2, −7), and (−2, 10). You need to calculate the area and perimeter of the gameboard. First, find the side lengths of the rectangle. Find the vertical distance between (8, 10) and (8, −7): 10(7) = 17. One side length is 17 units. Next, find the horizontal distance between the points (8, –7) and (–2, –7): 8(2) = 10. The other side length is 10 units. On a rectangle, opposite sides have equal length. The perimeter is the sum 17+10+17+10=54 units. If 1 unit is equal to 1 centimeter, the board game has perimeter 54 centimeters. The area of the rectangle is length times width, or 17 × 10=170 square centimeters. Try this yourself: What is the perimeter of a rectangle with vertices at (2, 2), (−2, 2), (−2, −2) and (2, −2)?
Find the perimeter of a shape using coordinates. You’ve designed a board game on a coordinate grid on the computer. The gameboard is a rectangle with vertices at (8, 10), (8, −7), (−2, −7), and (−2, 10). You need to calculate the area and perimeter of the gameboard. First, find the side lengths of the rectangle. Find the vertical distance between (8, 10) and (8, −7): 10(7) = 17. One side length is 17 units. Next, find the horizontal distance between the points (8, –7) and (–2, –7): 8(2) = 10. The other side length is 10 units. On a rectangle, opposite sides have equal length. The perimeter is the sum 17+10+17+10=54 units. If 1 unit is equal to 1 centimeter, the board game has perimeter 54 centimeters. The area of the rectangle is length times width, or 17 × 10=170 square centimeters. Try this yourself: What is the perimeter of a rectangle with vertices at (2, 2), (−2, 2), (−2, −2) and (2, −2)? 
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Science & Math$_{/yr}

Science Only$_{/yr}
In which quadrant is the point (−6, −7) located?
The coordinates of one end point of a line segment are 2,7. The line segment is 12 units long. Give one possible coordinate of the line segment’s other end point.
What is the area of the rectangle with vertices at (4, 3), (−2, 3), (−2, −1), and (4, −1)?
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