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5 x + y = 10

  1. ( 5 , 1 )
  2. ( 2 , 0 )
  3. ( 4 , −10 )

,

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y = 6 x 2

  1. ( 1 , 4 )
  2. ( 1 3 , 0 )
  3. ( 6 , −2 )
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Complete a Table of Solutions to a Linear Equation in Two Variables

In the following exercises, complete the table to find solutions to each linear equation.

y = 4 x 1

x y ( x , y )
0
1
−2
x y ( x , y )
0 −1 ( 0 , −1 )
1 3 ( 1 , 3 )
−2 −9 ( −2 , −9 )
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y = 1 2 x + 3

x y ( x , y )
0
1
−2
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x + 2 y = 5

x y ( x , y )
0
1
−1
x y ( x , y )
5 0 ( 5 , 0 )
1 2 ( 1 , 2 )
−1 3 ( −1 , 3 )
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3 x 2 y = 6

x y ( x , y )
0
0
−2
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Find Solutions to a Linear Equation in Two Variables

In the following exercises, find three solutions to each linear equation.

x + y = 3

Answers will vary.

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y = 3 x + 1

Answers will vary.

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Graphing Linear Equations

Recognize the Relation Between the Solutions of an Equation and its Graph

In the following exercises, for each ordered pair, decide

  1. if the ordered pair is a solution to the equation.
  2. if the point is on the line.

y = x + 4

  1. ( 0 , 4 )
  2. ( −1 , 3 )
  3. ( 2 , 2 )
  4. ( −2 , 6 )
The graph shows the x y-coordinate plane. The axes run from -7 to 7. A line passes through the points “ordered pair 0,  4” and “ordered pair 4, 0”.

  1. yes no yes yes
  2. yes no yes yes

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y = 2 3 x 1

  1. ( 0 , −1 )
  2. ( 3 , 1 )
  3. ( −3 , −3 )
  4. ( 6 , 4 )
The graph shows the x y-coordinate plane. The axes run from -7 to 7. A line passes through the points “ordered pair 0,  -1” and “ordered pair 3, 1”.
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Graph a Linear Equation by Plotting Points

In the following exercises, graph by plotting points.

Graph Vertical and Horizontal lines

In the following exercises, graph the vertical or horizontal lines.

Graphing with Intercepts

Identify the Intercepts on a Graph

In the following exercises, find the x - and y -intercepts .

Find the Intercepts from an Equation of a Line

In the following exercises, find the intercepts.

x y = −1

(−1,0) (0,1)

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Graph a Line Using the Intercepts

In the following exercises, graph using the intercepts.

Choose the Most Convenient Method to Graph a Line

In the following exercises, identify the most convenient method to graph each line.

y = −3

horizontal line

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y = 3 4 x 1

plotting points

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Understand Slope of a Line

Use Geoboards to Model Slope

In the following exercises, find the slope modeled on each geoboard.

In the following exercises, model each slope. Draw a picture to show your results.

Find the Slope of a Line from its Graph

In the following exercises, find the slope of each line shown.

Find the Slope of Horizontal and Vertical Lines

In the following exercises, find the slope of each line.

Use the Slope Formula to find the Slope of a Line between Two Points

In the following exercises, use the slope formula to find the slope of the line between each pair of points.

( −1 , −1 ) , ( 0 , −5 )

−4

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( 3 , 5 ) , ( 4 , −1 )

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( −5 , −2 ) , ( 3 , 2 )

1 2

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Graph a Line Given a Point and the Slope

In the following exercises, graph the line given a point and the slope.

( −3 , 4 ) ; m = 1 3


The graph shows the x y-coordinate plane. The x-axis runs from -6 to 6. The y-axis runs from -4 to 2. A line passes through the points “ordered pair -3,  4” and “ordered pair 1, 3”.

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Solve Slope Applications

In the following exercise, solve the slope application.

A roof has rise 10 feet and run 15 feet. What is its slope?

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Chapter practice test

Plot and label these points:

  1. ( 2 , 5 )
  2. ( −1 , −3 )
  3. ( −4 , 0 )
  4. ( 3 , −5 )
  5. ( −2 , 1 )


The graph shows the x y-coordinate plane. The axes extend from -6 to 6. a is plotted at 2, 5, b at -1, -3, c at -4, 0, d at 3, -5, and e at -2,1.

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Name the ordered pair for each point shown.

The graph shows the x y-coordinate plane. The axes extend from -7 to 7. A is plotted at -4, 1, B at 3, 2, C at 0, -2, D at -1, -4, and E at 4,-3.
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Find the x -intercept and y -intercept on the line shown.

 The graph shows the x y-coordinate plane. The x-axis runs from -7 to 7. The y-axis runs from -7 to 7. A line passes through the points “ordered pair 4,  0” and “ordered pair 0, -2”.

(4,0), (0,−2)

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Find the x -intercept and y -intercept of the equation 3 x y = 6 .

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Is ( 1 , 3 ) a solution to the equation x + 4 y = 12 ? How do you know?

no; 1 + 4 · 3 ≠ 12

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Complete the table to find four solutions to the equation y = x + 1 .

x y ( x , y )
0
1
3
−2
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Complete the table to find three solutions to the equation 4 x + y = 8

x y ( x , y )
0
0
3
x y ( x , y )
0 8 ( 0 , 8 )
2 0 ( 2 , 0 )
3 −4 ( 3 , −4 )
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In the following exercises, find three solutions to each equation and then graph each line.

In the following exercises, find the slope of each line.

Use the slope formula to find the slope of the line between ( 0 , −4 ) and ( 5 , 2 ) .

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Find the slope of the line y = 2 .

0

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Graph the line passing through ( 1 , 1 ) with slope m = 3 2 .

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A bicycle route climbs 20 feet for 1,000 feet of horizontal distance. What is the slope of the route?

1 50

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Practice Key Terms 1

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Source:  OpenStax, Prealgebra. OpenStax CNX. Jul 15, 2016 Download for free at http://legacy.cnx.org/content/col11756/1.9
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