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 ?
Stacey Warren - Expert brainly.com
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you need to use a system of equations
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
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solve b+m=18 for either b or m... we'll choose b
substitute that in for the second equation, 139=5b+12m
since we know m... we can plug that into the easier equation, b+m=18
so, since b=11 and m=7, we know that she babysat for 11 hours and gave music lessons for 7 hours
i gotcha now.
cool, good luck
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