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1) - 4x + 5y = 120 (3)
2) 3x + 2y = 62 (4)
- 12x + 15y = 360
12x + 8y = 248
--------------------------
0x + 23y = 608
23y = 608
y = 608/23
El valor de y lo reemplazo en ecuación 2
3x + 2y = 62
3x + 2 (608/23) = 62
3x + 1216/23 = 62
3x = 62 - 1216/23
3x = (62 * 23 - 1216)/23
3x = (1426 - 1216)/23
3x = 210/23
x = 210/23/3/1
x = 210/69
x = 70/23
Respuesta.
x = 70/23
y = 608/23