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3x+3y=37
5y=30
y=6
3x +18 =37
3x =19
x=19/3
1) 3x - 2y = 7 (3)
2) 3x + 3y = 37 (2)
9x - 6y = 21
6x + 6y = 74
------------------
15x + 0y = 95
15x = 95
x = 95/15
x = 19/3
Reemplazo x = 19/3 en ecuación 1.
3x - 2y = 7
3 (19/3) - 2y = 7
57/3 - 2y = 7
19 - 2y = 7
- 2y = 7 - 19
- 2y = - 12
y = -12/-2
y = 6
Solución :
x = 19/3
y = 6