Unless you know the slope, you can not.
What is the rest of the problem?
How do you find what x is?
(-2,8) and (x,12)
3 answers
They are ordered pairs and are for the same direct variation.
Oh, you need to know it is direct variation, That gives you the slope because the line goes through two known points, (0,0) and (-2,8).
slope = (8-0)/(-2-0) = -4
y = -4 x
12 = -4 x
x = -3
slope = (8-0)/(-2-0) = -4
y = -4 x
12 = -4 x
x = -3