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3x + 5y = 49
x + y = 13 | * ( - 3 )
- 3x - 3y = - 39
_______________
2y = - 10 | / 2
y = - 5
x + y = 13
x - 10 = 13
x = 23
x= 23
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3x + 5y = 49
x + y = 13 | * ( - 3 )
3x + 5y = 49
- 3x - 3y = - 39
_______________
2y = - 10 | / 2
y = - 5
x + y = 13
x - 10 = 13
x = 23
x= 23
y = - 5