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2x-3y=11
3x + y = 0 (x3)
2x - 3y = 11
9x + 3y = 0 >>> (ditambah)
11x = 11
x = 1
9x + 3y = 0
9(1) + 3y = 0
3y = 0-9
3y = -9
y = -9/3 = -3
2.) x=y+2 dan y = 2x - 5
x-y = 2 dan -2x + y = -5
x-y = 2 >>>(x2)
-2x + y = -5
2x-2y=4
-2x+y=-5 (ditambah)
-y = -1
y = 1
x-y=2
x-1=2
x=2+1
x = 3