### Home > CCA > Chapter 2 > Lesson 2.4.1 > Problem2-97

2-97.

Rena says that if $x=−5$, the equation below is true. Her friend, Dean, says the answer is $x=3$. Who is correct?  Justify your conclusion.

$9(x+4)=1+2x$

Substitute both numbers in for $x$ and see which one makes the statement true.

For example, if Joe said $x=2$:
\begin{aligned}9\left(2 + 4\right) &= 1 + 2\left(2\right)\\18 + 36 &= 1 + 4 \\ 54 &=5 \end{aligned}
False!
Now try with the given possible values.