Mathematics

A is partly constant and partly varies with B. When B =5, A=19 and when B=10, A=34. Find A when B is 7

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  1. A = k + mb
    so, using the given data, you know that you just have to solve
    k+5m = 19
    k+10m=34
    Clearly, m=3, so when B=7,
    A = k+7m = k+5m + 2m = 19+6 = 25

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