Digits, Grade 8, Volume 1, Homework Helper

### 2-5: TEKS Practice

• 1. Graph the equation y = 4x − 3 and find the y-intercept.

• 2. What is the y-intercept of the graph shown below? • 3. Think About the Process

• a. Before graphing, describe where on the graph of the line y = x − 2 the y-intercept will be located.

• A. The y-intercept will be located where the x-value is 1.

• B. The y-intercept will be located where the graph crosses the y-axis.

• C. The y-intercept will be located where the graph crosses the x-axis.

• D. The y-intercept will be located where the x-value is −1.

• b. Graph the equation.

• c. What is the y-intercept of the graph of the equation?

• 4. The line in the graph models the growth of a plant in the past 10 years. • a. What is the y-intercept of the line?

• b. What does the y-intercept represent?

• A. The height of the plant 10 years ago

• B. The growth of the plant each year

• C. The tallest the plant will grow

• D. How many years ago the plant was planted

• c. How many years ago did the plant start to grow?

• 5. Think About the Process

• a. How does the slope affect the graph of a line?

• A. The slope affects where the line ends.

• B. The slope affects the steepness of the line.

• C. The slope affects where the line starts.

• D. The slope affects where the line will cross the y-axis.

• b. Graph the equation y equals , 2 thirds , x minus 4 and identify the y-intercept.

• 6. Error Analysis Jamal's notes say to let x = 0 and solve for y to find the y-intercept of an equation. He incorrectly says the y-intercept of this equation is −3.

• a. Graph the equation y = x + 3.

• b. Find the y-intercept using Jamal's method.

• c. Which mistake might Jamal have made?

• A. He let x = 1 and solved for y.

• B. He let y = 0 and solved for x.

• C. He let y = 1 and solved for x.

• D. He let x = 0 and solved for y.

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