Karen makes $5 per hour baby-sitting and $12 per hour giving music lessons. One weekend, she worked a total of 18 hours and made $139. How many hours did she spend baby-sitting?
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Answer: 11 Hours
Step-by-step explanation:
Let the time spent for baby-sitting be represented by x and time spent for music lessons be represented by y.
Since she worked for 18 hours,
x + y = 18 ... 1
Since she made 139 dollars,
5x + 12y = 139 ... 2
Multiplying 5 to equation 1: 5x + 5y = 90 ... 3
Equation 2 minus Equation 3: 7y =49 , hence y = 7
Substituting y = 7 into equation 1 and solving for x gives us x = 11
Hence, Karen spend 11 hours babysitting
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