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22 May, 14:39

If (3, n) is a solution of Ax+3y=6 and (n, 5) is a solution of 5x+y=20, what is the value of A?

+1
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  1. 22 May, 15:07
    0
    We have 3A + 3n = 6 and 5n + 5 = 20;

    Then, 5n = 15;

    n = 3;

    Finally, 3A + 9 = 6;

    3A = - 3;

    A = - 1;
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