How do you simplify y equals 2x-5 and 4x-y equals 7?

y = 2x-5

4x-y = 7 => y = 4x-7

2x-5 = 4x-7

2x-4x = 5-7

-2x = -2

x = 1

Therefore by substituting: x = 1 and y = -3