Karen makes $5 per hour for babysitting and $12 per hour giving music lessons. One week she worked a total of 18 hours and made 139$ that day. How many hours did she spend babysitting ?

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you need to use a system of equations
b= babysitting
m= music lessons

we know she worked 18 hours, so.... b+m=18

we know how much she gets paid for each, and what she made...
12 for m
5 for b
so.... 139=5b+12m

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