SOLUTION: Calculate and plot the following equations y-x=3, xy=12

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Question 1068858: Calculate and plot the following equations y-x=3, xy=12
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
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y=x%2B3
Substituting,
x%28x%2B3%29=12
x%5E2%2B3x=12
x%5E2%2B3x%2B%283%2F2%29%5E2=12%2B%283%2F2%29%5E2
%28x%2B3%2F2%29%5E2=48%2F4%2B9%2F4
%28x%2B3%2F2%29%5E2=57%2F4
x%2B3%2F2=0+%2B-+sqrt%2857%29%2F2
x=-3%2F2%2B-+sqrt%2857%29%2F2
x=%28-3+%2B-+sqrt%2857%29%29%2F2