Question

resolva o sistema
x/2+y/3=3
3x+2y=6

Answer 1

x\2+y\3=3

3x+2y=18

x=(18-2y)\3

x=(18-2(-12))\3

x=18-2(-12)

x=18+24

x=42

3x+2y=6

3(18-2y\3)+2y=6

9(18-2y)+6y=18

162-18y+6y=18

-18y+6y=18-162

-12y=144

(-1)12y=-144

y=-12

(42,-12)