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Bell Ringer

Learn to write and solve direct variation equations with the constant of variation. Practice problems included. Improve your math skills!

arthurrobinson
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Bell Ringer

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  1. Learning Target: I can solve an equation for the constant of variation. Bell Ringer

  2. Direct Variation

  3. Definition: direct variation A direct variation is a function in the form y = kx where k does not equal 0.

  4. Definition: constant of variation The constant of variation is k, the coefficient of x.

  5. Write and Solve a Direct Variation Equation A. Suppose y varies directly as x, and y = 9 when x = –3. Write a direct variation equation that relates x and y.

  6. Write and Solve a Direct Variation Equation B. Use the direct variation equation to find x when y = 15.

  7. Write and Solve a Direct Variation Equation B. Suppose y varies directly as x, and y = 15 when x = 5. Use the direct variation equation to find x wheny = –45. A. –3 B. 9 C. –15 D. –5

  8. A.B. C.D. Write and Solve a Direct Variation Equation B. Dustin ran a 26-mile marathon in 3.25 hours. Graph the equation.

  9. A.1 hour B. C.16 hours D.2 hours Write and Solve a Direct Variation Equation C. Estimate how many hours it would take to jog 16 miles.

  10. Write and Solve a Direct Variation Equation Suppose y varies directly as x, and y = 24 and x = 4. Find y when x = 16.

  11. Write and Solve a Direct Variation Equation Suppose y varies directly as x, and y = 36 and x = 2. Find y when x = 6.

  12. Homework DV Worksheet

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