Question

Can someone please help me understand this question?
If y varies directly with x and y = -7 when x = -1, find x when y = -84.
A. 84
B. 7
C.-12
I got A (84)

Answer 1

Direct variation means y=kx
Set up a proportion.
\[\frac{ -7 }{ -1 }=\frac{ -84 }{ x }\]
-84 x -1= 84
84 / -7= -12 so it's C

Answer 2

oh, okay thank you so much :)