
Andrew M. answered 10/04/17
Tutor
New to Wyzant
Mathematics - Algebra a Specialty / F.I.T. Grad - B.S. w/Honors
Hi Des,
We need to get a on one side of the equal
sign and everything else on the other side.
y = 9(x+a)
divide both sides by 9
y/9 = x + a
subtract x from both sides
y/9 - x = a
This is the same as
a = y/9 - x