Question

Suppose y varies directly with x, and y = 45 when x = 3. What is the value of y when x = -6?

Answer 1

36

We should write a formula for their relationship:

Y = x+42. <- this is what a direct varieation is I believe.

So, when x is -6, y is +42 aka 36

Answer 2

y=-90

Explanation:

y = kx

45 = k 3

k = 15

~~~~~~~~~~~~

y = 15*-6

y=-90