Question

ache o valor de x e y:

{ 5x - y = 8
{ 2x + y = 13​

Answer 1

Resposta:

x=3

y=7

Explicação passo-a-passo:

$5x-y=8$

$5x-8=y$

$2x+y=13\\2x+(5x-8)=13\\7x-8=13\\7x=13+8\\7x=21\\x=\frac{21}{7} \\x=3$

$5x-y=8\\15-y=8\\15-8=y\\y=7$