Question

resolva o sistema
{x+2y=7
{4x-y=10

Answer 1

{x+2y=7
{4x-y=10
x=7-2y
4(7-2y)-y=10
28-8y-y=10
-8y-y=10-28
-9y=-18.(-1)
9y=18
y=18/9
y=2
x+2y=7
x+2.2=7
x+4=7
x=7-4
x=3
S={(3, 2)}