Question

Resolva:

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

Answer 1

{10y=10x+30
{x+2y=3
x=3-2y
10y=10(3-2y)+30
10y=30-20y+30
10y+20y=30+30
30y=60
y=60/30
y=2
x=3-2y
x=3-2.2
x=3-4
x=-1
S={(-1, 2)}