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14 August, 17:12

Fill in the other coordinate for the line 7x - 5y = 21: (4,)

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  1. 14 August, 20:52
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    7x - 5y = 21 ... (4,?) ... so sub in 4 for x and solve for y

    7 (4) - 5y = 21

    28 - 5y = 21

    -5y = 21 - 28

    -5y = - 7

    y = 7/5

    check ...

    7 (4) - 5 (7/5) = 21

    28 - 35/5 = 21

    28 - 7 = 21

    21 = 21 (correct)

    the other coordinate is 7/5 ... (4,7/5)
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