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15 September, 11:52

A=4b-15 a and b have to add up to 90 so whats the answer?

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  1. 15 September, 13:29
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    Step-by-step explanation:

    a+b=90

    a = 90-b

    Therefore, 90-b = 4b - 15

    90+15 = 4b + b

    105 = 5b

    b = 21

    substitute b in and get, 4 (21) - 15 = 69

    a=69 and b=21
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