Tuesday, August 13, 2013

Solve: {x+y^2=4 ,x^2+y^2=16}


x%2By%5E2=4
x%5E2%2By%5E2=16 

y%5E2=4-x 
therefore 
x%5E2%2B4-x=16 
so that 
x%5E2-x-12=0 

x=4 or x=-3 

x=-3 leads to y=++sqrt%287%29 or y=+-+sqrt%287%29 
x=4 leads to y=0 
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