Question

c) 3x + 2y = 16, sendo y = 5
d) 9x - 5y = 21, sendo x = -6​

Answer 1

Explicação passo-a-passo:

$\boxed{\begin{array}{lr} 3x+2y=16\\3x+5+5=16\\3x=16-10\\3x=6\\x=6/3\\x=2 \end{array}}$

Explicação passo-a-passo:

$\boxed{\begin{array}{lr} 9x-5y=21\\-54-5y=21\\-5y=21+54\\-5y=75\\5y=-75\\y=-75/5\\y=-15 \end{array}}$

Resposta;

c) x = 2

Resposta;

d) y = -15