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anonymous

  • 4 years ago

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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  1. anonymous
    • 4 years ago
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    you need to use a system of equations b= babysitting m= music lessons

  2. anonymous
    • 4 years ago
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    we know she worked 18 hours, so.... b+m=18

  3. anonymous
    • 4 years ago
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    we know how much she gets paid for each, and what she made... 12 for m 5 for b so.... 139=5b+12m

  4. anonymous
    • 4 years ago
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    solve b+m=18 for either b or m... we'll choose b b=18-m

  5. anonymous
    • 4 years ago
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    substitute that in for the second equation, 139=5b+12m b=18-m 139=5(18-m)+12m

  6. anonymous
    • 4 years ago
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    139=90-5m+12m 49=7m m=7

  7. anonymous
    • 4 years ago
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    since we know m... we can plug that into the easier equation, b+m=18 b+7=18 b=11

  8. anonymous
    • 4 years ago
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    so, since b=11 and m=7, we know that she babysat for 11 hours and gave music lessons for 7 hours

  9. anonymous
    • 4 years ago
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    thanks ! i gotcha now.

  10. anonymous
    • 4 years ago
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    cool, good luck

  11. anonymous
    • 4 years ago
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    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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