Introduce the variables and set up the system of equations: Rafael and Lucas go to the mall. The two of them buy a total of 15 t-shirts. Raf

Question

Introduce the variables and set up the system of equations: Rafael and Lucas go to the mall. The two of them buy a total of 15 t-shirts. Rafael gets 3 less than twice as many t-shirts than Lucas. How many t-shirts did each of them get?

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Bình An 2 weeks 2021-09-05T07:01:28+00:00 1 Answers 0 views 0

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    2021-09-05T07:02:45+00:00

    Answer:

    lucas = 9

    rafael = 6

    Step-by-step explanation:

    two equations can be derived from the question

    r + l = 15 equation 1

    r = l – 3  equation 2

    r = rafael

    l = lucas

    substitute for r in equation 1

    l – 3 + l = 15

    combine similar terms

    l + l = 15 + 3

    2l = 18

    l = 9

    substitute for l in equation 1

    r + 9 = 15

    r = 15 –  9

    r = 6

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