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16 May, 11:25

Jenny makes $4 an hour for babysitting and $7 an hour for tutoring math. Jenny's parents do not want her to work more than 20 hours per week. Jenny would like to earn $110 a week. Which of these possibilities would be a solution to her dilemma?

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  1. 16 May, 11:35
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    Jenny babysits for 10 hours and tutors for 10 hours.

    4x+7y=110

    x+y=20

    4x+7y=110

    -4 (x+y) = (20) - 4

    4x+7y=110

    -4x-4y=-80

    3y=30

    - -

    3 3

    y=10hours of tutoring

    20hours-10hours=10hours of babysitting
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