5x + y = 3
y = 3 - 5x
Substitute this value into second equation,
8x + 5y = 7
8x +5(3 - 5x) = 7
8x + 15 - 25x = 7
-17x = 7 - 15
x = 8/17
Now, substitute it into first equation,
y = 3 - 5x
y = 3 - 5*8 / 17
y = 3 - 40/17
y = 11/17
In short, Your Answers would be: x = 8/17 & y = 11/17
Hope this helps!