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2a - b = 5 (×3) 6a - 3b = 15
-------------------- -
-2a = 0
a = 0
2) 3x + 2y = 7 (×1) 3x + 2y = 7
x - 4y = -7 (×3) 3x - 12y = -21
---------------------- -
14y = 28
y --> 28 : 14 = 2
x - 4y = -7
x -(-8) = -7 nilai x + y
x + 8 = -7 15 + 2 =17
x = 8+7 = 15