Question

Tomas bought 3 software apps and 2 e-books for a total of $21. The two e-books cost $12. If s represents the cost of each app, the total cost of all 5 items is represented by mc021-1.jpg. Which statement about verifying the solution for s is true?

Answer 1

Answer:

s=3

Step-by-step explanation:

Answer 2

First compute the cost of the three apps:
$21-12=9$
The cost of the three apps is $9 then. 
Since s is the price of the apps, we deduce the equation:
$3s=9$ which means that $s=3$