Given: 5x+4y=5. Prove: y=5/12

Question

Given:5x+4y=5

Prove:y=5/12

Answer 1

It takes 2 independent equations to solve for 2 unknowns x and y.  You only provided 1 equation with no indication of a value for x.  With the given information, the best you can get is y as a function of x.  There is not sufficient information to prove that y = 5/12.