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ubah pers. 1 jadi 15x-5y=30 dikurangi 2x-5y=17 dapat x = 1
substitusi x=1
2x-5y=17
2(1) - 5y = 17
-5y = 15
y = -3
y - x = 1 - (-3) = 4
-y = -3x +6
y = 3x -6
2x-5y=17
2x-5(3x-6)=17
2x-15x+30=17
-13x=17-30
-13x= -13
x = 1
y=3x-6
= 3(1)-6 = 3-6 =-3
y-x= -3-1=-4