13-07-2017
Mathematics

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Using substitution solve the following system of equations x^2 -y=1 and x+y=11

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13-07-2017

We have y = 11 - x;
Then, x^2 - 11 + x = 1;
x^2 + x - 12 = 0;
a = 1; b = 1; c = -12;
We obtain the solution x1 = (- 1 +

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