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17 June, 01:17

X^2+y^2=49, y=7-x solve it in substitution

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  1. 17 June, 04:07
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    X^2 + (7-x) ^2=49

    x^2+x^2-14x+49=49

    2x^2-14x=0

    2x (x-7) = 0

    x=0, x=7
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