### Home > CAAC > Chapter 5 > Lesson 5.1.4 > Problem5-40

5-40.

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 $x=2$:
$9(2+4)=1+2(2)$
$18+36=1+4$
$54=5$
False!
Now try with the given possible values.