Question

if y=3x+4 and y=2x+8, find the value of both x and y.

Answer 1

$\begin{cases}y=3x+4 \\ y=2x+8\end{cases}\rightarrow3x+4=2x+8\rightarrow3x-2x=4\rightarrow x=4$

having that x=4, we get that

$y=2\cdot4+8=16$