help plz.....

If the system of equations 3x+y=a, 2x+5y=2a, has a solution (x,y) when x=2, compute a.

3x + y = a

2x + 5y = 2a.

Then the first equation x 2 = second equation.

6x + 2y = 2x + 5y

4x = 3y

So if x = 2, then y = 8/3.

Thus 3*2 + 8/3 = a = 26/3

The answer is actually 28/5, but thanks for your help.