Question

Ajuda pfvv, obrigadaaa ♡​

Answer 1

Resposta:

Explicação passo-a-passo:

Vamos resolver cada equação.

a) Errado (E)

$5-7a=6a+8\\-7a-6a=8-5\\-13a=3\\\\\boxed{a=-\dfrac{3}{13}}$

b) Correto (C)

$5y-10-20=15-y-3\\5y+y=12+30\\6y=42\\\\y=\dfrac{42}{6}\\\\\boxed{y=7}$