If y varies directly with x and y=4 and y=12. Find the direct variation equation (find k and put into an equation).
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For starters, write three factors which would give you the x-intercepts of -5, 1/2, and 3, those being (x+5), (x-1/2), and (x-3). Now, multiply the factors and set y equal to them, giving you 
. Now, find your y-intercept, 
and subtract it from your desired y-intercept, 15-7.5=7.5. Now add this to your equation, 
making your answer 
.