Question 33457
Its simple just substitute the value if y in the second equation
y=x-4
4x+y=26

4x+y = 26
4x+(x-4) = 26
4x + x -4 = 26
3x = 26+4 = 30
x = 30/3 =10
y = x -4
y = 10 -4 = 6
x = 10; y = 6