Read the slope and y-intercept from y = mx + b

Answer Key - Grade 8 Math Worksheet - Challenge Me

Circle the best answer, or write your answer on the line.

1. 1.

   Bo meets the rule y = 5 + 3x in math club. What is the slope of its line?

   3
2. 2.

   Esme meets the rule y = 6(x + 7) in math club. What is the y-intercept of its line?

   42
3. 3.

   Jun meets the rule y = 4(x − 3) in math club. What is the y-intercept of its line?

   -12
4. 4.

   Luz meets the rule 3y = 6x − 12 in math club. What is the y-intercept of its line?

   -4
5. 5.

   Milo meets the rule y − 4 = 2x in math club. What is the y-intercept of its line?

   4
6. 6.

   Tala meets the line y = -2x ÷ 5 + 1 in math club. What is its slope?

   -2/5
7. 7.

   Zee meets the line y = 2.5x − 0.5 in math club. What is its y-intercept?

   -0.5
8. 8.

   Ari meets the line y = -x ÷ 2 − 9 in math club. What is its y-intercept?

   -9
9. 9.

   Bo graphs y = 2x + 1 and then y = 2x + 6. How does the new line compare with the first one?

   • Same steepness, moved up 5
   • Same steepness, moved down 5
   • Steeper, through the same point on the y-axis
   • Same steepness, moved up 6
10. 10.

    Esme graphs y = -x + 3 and then y = -x − 4. How does the new line compare with the first one?

    • Same steepness, moved down 4
    • Same steepness, moved down 7
    • Steeper, through the same point on the y-axis
    • Same steepness, moved up 7