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21 May, 16:14

The pair of variables x=5, y=7 is the solution to the equation ax-2y=1. Find the coefficient a.

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  1. 21 May, 18:05
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    a = 3

    Step-by-step explanation:

    Put x = 5 and y = 7 to the equation ax - 2y = 1 and solve for a:

    (a) (5) - (2) (7) = 1

    5a - 14 = 1 add 14 to both sides

    5a - 14 + 14 = 1 + 14

    5a = 15 divide both sides by 5

    5a : 5 = 15 : 5

    a = 3
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