Question 302003
x=y-5 ... equation 1
2x+5y=4 ... equation 2

Put equation 1 into equation 2

2(y-5) + 5y = 4
2y - 10 + 5y = 4
7y - 10 = 4
7y = 4 + 10 
7y = 14
y = 14/7
y = 2

Sub y = 2 into equation 1
x = 2 - 5
x = -3

Answer : x = -3 and y = 2