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2x - y = 8 | × 2 |
3x + 2y = 12
4x - 2y = 16
------------------- +
7x = 28
x = 4
2x - y = 8
8 - y = 8
y = 0
2). 2x + y = 5 | ×3 |
3x - 2y = 4 | ×2 |
6x + 3y = 15
6x - 4y = 8
----------------- -
7y = 7
y = 1
2x + y = 5
2x + 1 = 5
2x = 4
x = 2