Friday, September 27, 2013

Simultaneous Equation



Solve for x and y

x2 + xy = 8   ---------------------  (1)
x - y = 6    ------------------------ (2)


We have y = x – 6 from (2)
Substituting in (1) we get
x2 + x(x – 6) = 8   
or, x2 – 3x – 4 = 0
or, x = 4, -1

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