Question

Solve the perimeter for an isosceles triangle, p=2a+b, for a.

Answer 1

a= 1/2p-b

Explanation:

p=2a+b

divide by 2 on both sides

1/2 p = a+b

subtract b from both sides

1/2 p - b = a

flip equation (not needed, just personal preference)

a= 1/2p-b

(Sorry if I didn't understand well enough and got it wrong)