Question

Resolva o sistema
a) {10 y=10 x+30
{x+2 y=3

Answer 1

10y=10x+30
x+2y=3 ->x=3-2y

10y=10x+30
10y=10(3-2y)+30
10y=30-20y+30
10y+20y=30+30
30y=60
y=60/30
y=2

x+2y=3
x+2*(2)=3
x+4=3
x=3-4
x=-1

S{-1,2}