3x + 5y = -9
15x + 25y = -45
5x + 7y = - 19
15x + 21y = - 57
15x + 21y = -57
----------------------- -
4y = 12
y = 3
3x + 15 = -9
3x = -9-15
3x = -24
x = - 8
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3x + 5y = -9
15x + 25y = -45
5x + 7y = - 19
15x + 21y = - 57
15x + 25y = -45
15x + 21y = -57
----------------------- -
4y = 12
y = 3
3x + 5y = -9
3x + 15 = -9
3x = -9-15
3x = -24
x = - 8
5x + 7y = -19 |×5| 25x + 35y = -95
_______________-
-4x = -32
x = 8
3x + 5y = -9
3(8) + 5y = -9
24 + 5y = -9
5y = -9 - 24
5y = -33
y = 6,6