Question

What is the direct variation equation if y varies with directly with x and y=-5 when x=-15?

Answer 1

direct variation equations are in the form

y = kx (original equation)

you need to find k, given when x = -15, y = -5

so

\[-5 = k \times -15\]

then substitute the value into the original equation... and that's all you need to do.

Answer 2

oh ok thanks so much!