y = 2x - 5
-8x - 4y = -20
substitute one equation to the other;
-8x - 4y = -20
-8x - 4(2x - 5) = -20
-16x + 20 = -20
solve for x;
-16x + 20 = -20
-16x = -40
x = 5/2 or 2.5
substitute x = 5/2 to find the y;
y = 2x - 5
y = 2(5/2) - 5
y = 0
one solution; (2.5, 0) is your answer.
hope this helped, God bless!