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4x - 3y = 15
6x + 9y + 9 = 0
6x + 9y = -9
4x-3y=15 |×3| 12x-9y=45
6x+9y=-9|×1| 6x+9y=-9
---------------------------------(+)
18x = 36
x = 2
4x - 3y = 15
4.2 - 3y = 15
8 - 3y = 15
-3y = 15 - 8
-3y = 7
y = -7/3