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Marlee makes $5 an hour working after school and $6 an hour working on Saturday. Last week she made $64.50 by working a total of 12 hours.

How many hours did she work on Saturday
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2 Answers

X + Y = 12
 
5X + 6Y = 64.50
 
5x + 6(12 - x) = 64.50
 
5x + 72 - 6x = 64.50
 
72 - x = 64.50
 
-x = 64.50 - 72
 
-x = -7.50
 
x = 7.5
 
y = 4.5
 
7.5 hours working after school and 4.5 on Saturday
s represents her Saturday hours
12 - s represents her after school hours
 
6s + 5(12 - s) = 64.50
 
Can you solve for s and answer?