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?

    A graph of a line slanting upward through (-1.5, 0), (0, 1.5), and (1.5, 3).

  • 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 graph.

    • 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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Table of Contents

Digits, Grade 8, Volume 1, Homework Helper Unit A: Number and Operations Unit B: Proportionality Unit C: Expressions, Equations, and Relationships English/Spanish Glossary Formulas Math Symbols Formulas Measures Properties