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22 August, 00:26

Determine whether (7 ,9 ) is a solution of 7x+2y = - 7.

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  1. 22 August, 03:08
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    We can check by subbing in the values.

    7x + 2y = - 7

    (7,9) ... x = 7 and y = 9

    now we sub

    7 (7) + 2 (9) = - 7

    49 + 18 = - 7

    67 = - 7 (incorrect) ... therefore, (7,9) is NOT a solution for this equation
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