Aul bought 9 total shirts for a total of $72. tee shirts cost $10 and long sleeve shirts cost $7. how many of each type of shirt did he buy? a. 5 tee shirts and 4 long sleeve shirts b. 3 tee shirts and 6 long sleeve shirts c. 7 tee shirts and 2 long sleeve shirts d. 4 tee shirts and 5 long sleeve shirts

Set up a system of equations:

x represents how many tee shirts were bought, and y represents how many long sleeve shirts were bought.

For the first equation, subtract y from both sides to get x by itself:

We'll now use substitution. Since x is equal to a value, we can substitute this value for the other equation:

Distribute the 10 to both terms in parentheses:

Combine like terms:

Subtract 90 from both sides:

Divide both sides by -3 to get y by itself:

6 long sleeve shirts were bought.

Now you have a value for y. Input this value into the first equation:

Subtract both sides by 6 to get x by itself:

3 tee shirts were bought.

The answer is B. 3 tee shirts and 6 long sleeve shirts.