Question

4x+y=7
2x-5y=9
qual e o resultado do metodo da adicao

Answer 1

{4x+y=7
{2x-5y=9
4x+y=7.(5)
{20x+5y=35
{2x-5y=9
22x=44
x=44/22
x=2
2x-5y=9
2.2-5y=9
4-5y=9
-5y=9-4
-5y=5.(-1)
5y=5
y=5/5
y=1
S={(2, 1)}