A student bought a calculator and a textbook for a course in algebra. He told his friend that the total cost was $115 (without tax) and that

Question

A student bought a calculator and a textbook for a course in algebra. He told his friend that the total cost was $115 (without tax) and that the calculator cost $20 more than four times the cost of the textbook. What was the cost of each item? Let x= the cost of a calculator and y= the cost of the textbook. The corresponding modeling system is {x+y=115x=4y+20. Solve the system by using the method of substitution.

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Thiên Di 5 years 2021-08-23T10:37:13+00:00 1 Answers 30 views 0

Answers ( )

  1. Doris
    0
    2021-08-23T10:38:45+00:00
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    Answer:

    X=$96

    Y=$19

    Step-by-step explanation:

    x=4y+20

    X+Y=$115

    4Y+20+Y=$115

    5Y+20=$115

    -20 -20

    5Y=$95

    /5 /5

    Y=$19

    X=4 x $19 + $20

    X=$76+$20

    X=$96

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