SOLUTION: If x = 4a+7 and y = 16a2, what is y in terms of x?

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: If x = 4a+7 and y = 16a2, what is y in terms of x?      Log On


   

Question 975958: If x = 4a+7 and y = 16a2, what is y in terms of x?
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

x+=+4a%2B7 and y+=+16a%5E2,
y in terms of x:
x+=+4a%2B7..........solve for a
x-7+=+4a
%28x-7%29%2F4+=+a.......substitute in y+=+16a%5E2

y+=+16%28%28x-7%29%2F4%29%5E2
y+=+16%28%28x-7%29%5E2%2F4%5E2%29
y+=+cross%2816%29%28%28x-7%29%5E2%2Fcross%2816%29%29
y+=+%28x-7%29%5E2
y+=+x%5E2-14x%2B49