4.4 Notes - Direct Variation

What kind of relationship is direct variation?

• Quadratic

• Exponential

• Proportional

• Inverse

If y varies directly as x, and y = 6 when x = 8, what is the constant of variation?

• 6/8

• 8/6

• 3/4

• 4/3

If y varies directly as x, and y = 6 when x = 8, what is the value of y when x = 12?

• 8

• 9

• 10

• 12

The force required to stretch a spring (F) varies directly with the amount the spring is stretched (S). If 10 pounds is needed to stretch a spring 8 inches, how many pounds would be needed to stretch the spring 32 inches?

• 20 pounds

• 30 pounds

• 40 pounds

• 50 pounds