Direct Variation - 1

10

If y = -7 when x = -14, find y when x = 20.

14

During a football season, the Mustangs scored 5 touchdowns to 2 field goals. If the Mustangs have scored 35 touchdowns, how many field goals will they have scored?

40

Haley correctly answered 12 out of 15 questions on a recent test. If she keeps the same ratio of correct questions to total, she will answer 32 questions out of how many total?

y = 0.5x

If y = -7 when x = -14, write the direct variation equation.

x = 8.1

If y = 10 when x = 9, find x when y = 9.

y = 10/9x

If y = 10 when x = 9, write the direct variation equation and find x when y = 9.

x = 10

If y = 27 when x = 6, find x when y = 45.

y = 4.5x

If y = 27 when x = 6, write the direct variation equation.

yes

Is the equation y = 5/7x a direct variation?

no

Is the equation y = x + 8 a direct variation?

12

Solve if y varies directly with x: If y = -4 when x = 2, find y when x = -6.

15

Solve if y varies directly with x: If y = -9 when x = 3, find y when x = -5.

5

Solve if y varies directly with x: If y = 45 when x = 15, find x when y = 15.

8

Solve if y varies directly with x: If y= -8 when x = -2, find x when y = 32.

-24

Solve if y varies directly with x:: If y = 12 when x = 18, find x when y = -16.

k = -7

What is the constant of proportionality for y = -7x?

k = 2.5

What is the constant of proportionality for y = 2.5x?

k = 4/3

What is the constant of proportionality for y = 4/3x?

3/2

Write the equation and solve if y varies directly with x: If y = 4 when x = 16, find y when x = 6.

y = 1/4x

Write the equation and solve if y varies directly with x: If y = 4 when x = 16, find y when x = 6.

y = -2x

Write the equation if y varies directly with x: If y = -4 when x = 2, find y when x = -6.

y = -3x

Write the equation if y varies directly with x: If y = -9 when x = 3, find y when x = -5.

y = 3x

Write the equation if y varies directly with x: If y = 45 when x = 15, find x when y = 15.

y = 4x

Write the equation if y varies directly with x: If y= -8 when x = -2, find x when y = 32.

y = 2/3x

Write the equation if y varies directly with x:: If y = 12 when x = 18, find x when y = -16.