Kimaya decided to by mangos and pineapples for her snack this week.
Mangos, m, cost $1.50 each. Pineapples, p , cost $3.00 each. She wants to spend $18

Here is Kimaya's work to solve 1.5m+3p=18:
1.5m+3p=18
-3p -3p
1.5m=18-3p
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1.5 1.5
m=12-2p

1. What does the 12 and -2 say about the situation
2. Solve 1.5m+3p=18 for p