Question

Write the direct linear variation equation for the relationship:

y varies directly with x and y = 4 when x = 12.

Answer 1

y = x-8

Answer 2

but how did you know?

Answer 3

The equation should be in the form\[y=kx\]where k is a constant. We know that y=4 when x=12, so plug these values in the equation and solve for k.

Answer 4

er, how did you solve it?

Answer 5

4=12k

Answer 6

k=3

Answer 7

y=3x?

Answer 8

Correct.

Answer 9

how did she get x-8 LOL then?