Question

Encontre o valor de M para que o termo (8,m,2) seja soluçao da equaçao x+2y+5z=4

Answer 1

$\large\boxed{\begin{array}{l}\rm(8,m,2)\in x+2y+5x=4\iff x=8,m=y,x=2.\\\rm 8+2\cdot m+5\cdot2=4\\\rm 8+2m+10=4\\\rm 2m=4-10-8\\\rm 2m=-14\\\rm m=-\dfrac{14}{2}\\\\\rm m=-7\end{array}}$