Question

Qual a solução do sistema 12x+12y=120
5x-5y=-10

Answer 1

12X+12Y=120                                12X=120-12Y
5X- 5Y  =-10                                     X=120-12Y/12
5(120-12Y)/12-5Y=-10                   X=120-12.6/12
(600-60Y/12)-5Y=-10                                                       X=120-72/12
50-5Y-5Y=-10                                                       X=48/12
-10Y=-10-50
-10Y=-60(-1)                                 X=4

10Y=60
Y=60/10
Y=6
SOLUÇÃO X=4 E Y=6