Direct and Inverse Variations

If x and y vary inversely, as y increases, what happens to the value of x?

• decreases

• increases

If x and y vary directly, as y increases, what happens to the value of x?

• increases

• decreases

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

Find the value of k.

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

Find the value of y.

Given: y varies inversely with x. If y = 40 when x = 16, find x when y = -5.

Find the value of k.

Given: y varies inversely with x. If y = 40 when x = 16, find x when y = -5.

Find the value of x.

Suppose y varies directly as x, and y = 9 when x = 3/2. Find y when x = -1/2.

What is the value of k?

Suppose y varies directly as x, and y = 9 when x = 3/2. Find y when x = -1/2.

What is the equation of the variation?

Suppose y varies directly as x, and y = 9 when x = 3/2. Find y when x = -1/2.

What is the value of y?

If x and y vary directly, as x decreases, what happens to the value of y?

• increases

• decreases