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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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 ?

Mathematics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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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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Other answers:

solve b+m=18 for either b or m... we'll choose b b=18-m
substitute that in for the second equation, 139=5b+12m b=18-m 139=5(18-m)+12m
139=90-5m+12m 49=7m m=7
since we know m... we can plug that into the easier equation, b+m=18 b+7=18 b=11
so, since b=11 and m=7, we know that she babysat for 11 hours and gave music lessons for 7 hours
thanks ! i gotcha now.
cool, good luck
Chris put 1,500 $ in a savings account at an annual interest rate of 5%. If Chris does not deposit or withdraw any money, what is the amount of interest Chris will earn the first year her money is in the savings account ?

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