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x = 3- y
x = 3- y di sub ker pers x + 2y = 4
maka 3- y + 2y = 4
y = 4 + 3
= 7
y= 7 di sub ke pers x + y = 3
maka x + 7 = 3
x = 3 - 7
= -4
jadi x = -4 dan y= 7
x+2y = 4
x+2(x-3) = 4
x+2x-6 = 4
3x = 4+6
3x = 10
x = 10/3 = 3,33..
x+y=3
3,33+y=3
y= 0,33