# What are the variables and equation if Peter’s Lawn Mowing Service charges $10 per job and$0.20 per square yard and he earns $25 for a job? ##### 1 Answer Jan 2, 2015 $10+$0.20*x=$25
Where $x$ is the number of square yards.

From this we can easily derive the size of the lawn:

Step 1: $- 10$ on both sides:
$0.2 \cdot x = 15$

Step 2: divide both sides by $0.2$
$x = 75$

Conclusion:
The lawn is 75 square yards .
(don't forget the last part, or you'll get remarks like "75 what?")