The second equation can be rewritten: 7x=2y-30 by adding 2y to both sides.
We have the term 7x in the other equation, so we can substitute for 7x: 2y-30+2y=2.
Add the y's together: 4y-30=2; adding 30 to each side: 4y=32, and, dividing through by 4, y=8.
From substituting this value we get 7x=16-30=-14, and dividing through by 7, x=-2. So the solution is: x=-2 and y=8.