Question

Which is the direct linear variation equation for the relationship?

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








A.

y = 2x + 4








B.
y = 3x





C.
y = x + 8





D.

y = x – 8

Answer 1

y varies as x
y=kx
y=12 when x=4
12=k4
divide 4
3=k
y=3x is equation
answer is B