You are told that y is proportional to x^2 and that y=75, x=5. Find a formula for y in terms of x.
You know that y is proportional to x2, so let y=kx2 . You also know that y=75 and x=5. Substitute y=75 and x=5 into the equation y=kx2 . Therefore: 75=k multiplied by 52. 75=25k. 75/25=k. k=3. Put k back into the original equation y=kx2 . y=3x2.
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