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22 July, 19:11

If 4u-5v=23 and 2u+4v=-8, find the value of u+v

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  1. 22 July, 23:02
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    -1

    Step-by-step explanation:

    4u-5v=23

    -2 (2u+4v=16) We multiply by - 2 here to destroy u's.

    4u-5v=23

    -4u-8v=16 we addition both processes

    -13v=39 so, v=-3

    4u-5 (-3) = 23, 4u=8 so, u=2

    u+v = - 3+2 = - 1
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