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3y + 2x = 29
Eliminasi x
2y - x = 10 |×2
3y + 2x = 29 |×1
------------------------
4y - 2x = 20
3y + 2x = 29
------------------- +
7y = 49
y = 49/7
y = 7
Substisusi ke persamaan (1)
2y - x = 10
2(7) - x = 10
14 - x = 10
- x = 10 - 14
- x = -4
x = 4
x = a
y = b
4a + 3b = 4x + 3y
4(4) + 3(7)
16 + 21
37