CPM Homework Help : CCAA Problem 6-5

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.

Example:

If Joe said $x=2$
$\begin{array}{c} 9((2)+4)=1+2(2) \\ 9(6)=5 \; \; \\ \, 54=5 \end{array}$

This statement is not true.

Now you try with the numbers given in the problem.