Direct and Inverse Variation

Direct or Inverse

1

y=7/x

Inverse

2

y=4x

Direct

3

r=9/d

Inverse

5

y=-14x

Direct

Constant of Variation

1

Given y=-5x, what is the constant of variation

-5

2

If y varies inversely with x and y=40 when x=16. What is the constant of variation?

k=640

3

If y varies directly with x and y=28 when x=7.

k=4

5

If y varies directly with x and y=-4 when x=2. What is the constant of variation?

k=-2

Direct and Inverse Variation

1

Given that y varies inversely with x and y=3 when x=2. Find y when x=3

y=2

2

Direct variation forms what type of function?

LINEAR

3

TRUE OR FALSE : Is the equation y = 14x a direct variation?

TRUE

5

The brightness (B) of a light varies inversely as the distance (d). If B=200 when d=2, find B when d=5.

B = 80