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17 September, 15:40

If a-b=10 and a+b=31 what is the value of 3a-2b

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  1. 17 September, 16:06
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    a - b = 10

    a + b = 31

    (a - b) + (a + b) = 10 + 31

    2a = 41

    a = 41/2

    41/2 - b = 10

    b = 21/2

    3a - 2b = 3 (41/2) - 2 (21/2) = 81/2
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