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x + y = 2 x + y = 2
x - y = 8 x - y = 8
---------------- - --------------- +
2y = -6 2x = 10
y = -3 x = 5
subsitutsi
x + y = 2 x + y =2
x - y = 8 x + -3 =2
--------------------- - x = 5
2y = -6
y = -3
2. eliminasi
2x - 3y = 6 (x1) 2x - 3y = 6
x - y = 1 (x2) 2x - 2y = 2
---------------------- -
-1y = 4
y = -4
2x - 3y = 6 (x1) 2x- 3y = 6
x - y = 1 (x3) 3x - 3y = 3
---------------------- -
-1x = 3
x = -3
substitusi
2x - 3y = 6 (x1) 2x - 3y = 6
x - y = 1 (x2) 2x - 2y = 2
---------------------- -
-1y = 4
y = -4
2x - 2y = 2
2x - 2(-4) =2
2x + 8 = 2
2x = 2- 8
2x = -6
x = -3