Question

Resolva o sistema
1x+1y=7
2x-1y=2

1×+1y=2
3x+2y=3

3×+1y=3
2×-3y=1

Ajuda

Answer 1

a) 3x=9

x=9/3
x=3

b)-2x -2y = -4
3x +2y = 3

x=-1

c)9x+3y=9
2x-3y=1

11x=10
x=11/10