Question

. A solução da equação 8(x+1)+5(y+1)=4, sabendo que x=10 é: *​

Answer 1

Substituindo o valor de "x" na equação, temos:

$8\cdot(x+1)~+~5\cdot(y+1)~=~4\\\\\\8\cdot(10+1)~+~5\cdot(y+1)~=~4\\\\\\8\cdot11~+~5\cdot(y+1)~=~4\\\\\\88~+~5\cdot(y+1)~=~4\\\\\\5\cdot(y+1)~=~4-88\\\\\\y+1~=~\dfrac{-84}{5}\\\\\\y~=~\dfrac{-84}{5}~-~1\\\\\\y~=~\dfrac{-84-5}{5}\\\\\\\boxed{y~=\,-\dfrac{89}{5}~~ou~\,-17,8}$