CPM Homework Help : AC Problem 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.

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

Hint:

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

More Help

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.