Question

The question is in the picture.

Answer 1

varies directly means $\frac{y}{x} = k$

inserting y = -18 and x = 3 ⇒   $\frac{-18}{3} = k$   ⇒   -6 = k

next, insert k = -6 into the varies directly equation and solve for y. y = -6x

Answer: C