Question

What is the direct variation equation if f(x) varies directly with x and f(x) = –12 when x = 6?
(Points : 1)

f(x) = –2x
f(x) =-1/2x
f(x) = –6x
f(x) = –18x

Answer 1

f(x) = -12x
f(6) = -12x
 6         6
f(x) = -2x