kreamykraka80

2022-07-03

Solving a system in 3 variables problem
Find $x$, $y$, and $z$ from the problem below.
$\begin{array}{rcl}-2x+1& =& 5\\ \\ 2x+3y-4z& =& 7\\ \\ 3x+2y+2z& =& 3\end{array}$

Dayana Zuniga

Expert

Since in the first equation you have $-2x=4$, then $x=-2.$ Plug in this $x$ value into the other two equations and you essentially have a system of $2$ equations and $2$ unknowns which simplifies the problem more. Hopefully you can take it from here.