wcj2281 wcj2281

27-11-2017
Mathematics

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

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emar8092 emar8092

27-11-2017

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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