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9 March, 10:11

For what values of k do the lines 2x + ky = 3 and kx + 8y = 7 intersect?

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  1. 9 March, 13:41
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    ky=3-2x

    y = (3-2x) / k

    y = (7-kx) / 8

    (3-2x) / k = (7-kx) / 8

    8 (3-2x) = (7-kx) k

    24-16x=7k-k*kx

    24=7k-kkx+16x

    24+7k=kkx+16x

    24+7k=x (k^2+16)
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