Solve Linear System using Elimination?

Question

4x - y = 5
4x + 4y = -4

If someone can show step by step how they solved the problem, that'd be great. Thanks.

Answer 1

Subtract second equation from first equation

4x - y = 5
4x + 4y = -4

--------------------

-5y = 9

divide each side by -5

y = -9/5

Substitute y = -9/5 in 4x - y = 5

4x + 9/5 = 5

4x = 5 - 9/5 = 16/5

Divide each side by 4

x = 4/5

I hope it helps ...