Question

Calcule o sistema 2x+y=10 _x+3y=15

Answer 1

{2y+y=10
{x+3y=15

y=10-2x

x+3(10-2x)=15
x+30-6x=15
x-6x=15-30
-5x=-15
x=-15/-5
x=3

y=10-2.3
y=10-6
y=4

espero ajudar ♥