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.

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

   -12
3. 3.

   Kira meets the rule 2y = 8x + 6 in math club. What is the slope of its line?

   4
4. 4.

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

   4
5. 5.

   Ren meets the line y = 3x ÷ 4 − 6 in math club. What is its slope?

   3/4
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.

   After sunset, the temperature at Pia's campsite follows T = -2h + 6, with T in °C after h hours. What does the 6 tell?

   • The temperature drops 6 °C each hour
   • It was 6 °C at sunset (hour 0)
   • It will be 6 °C in 2 hours
9. 9.

   In Ren's puzzle game, the stars follow s = 10n + 50 after n levels. What does the 10 tell?

   • There are 10 levels
   • The game starts with 10 stars
   • Each level adds 10 stars
10. 10.

    Luz meets the line y = 0.25x − 3.5 in math club. What is its y-intercept?

    -3.5