Question

quanto é ×+y=23/x-y=3

Answer 1

$\left \{ {{x+y=23} \atop {x-y=3}} \right. \\\\x-y=3\\x=3+y\\\\x+y=23\\(3+y)+y=23\\2y=23-3\\2y=20\\y= \frac{20}{2}\\y=10 \\--------\\x=3+y\\x=3+10\\x=13$

Answer 2

Resposta:

Explicação passo-a-passo:

-2(m + 4 )=