Wednesday, April 24, 2013

Find the points of intersection of the curve xy=6 and the the line y=9-3x

To find the points of intersection of the curve xy =6 and
the line y =
9-3x,


Solution:


xy =
6......(1)


y =
9-3x................(2).


We eliminate y between xy = 6 and 
y = 9-3x by substituting y = 9-3x fot y in xy=6.


x(9-3x) =
6.


9x-3x^2= 6


9x-3x^2 -6 =
0


Multiply by (-1):


3x^2 -9x +
6 = 0


Divide by 3:


x^2-3x+2 =
0


(x-1)(x-2) = 0


x-1 = 0. Or
x-2 = 0


x = 1 . Or x = 2.


To
get corresponding y values, put x= 1  in xy = 6: 1*y = 6. Or y =
6.


Put x= 2 in xy =6: 2*y = 6. So y = 6/2 =
3.


Therefore (x,y) = (1,6) or (x,y) = (2,3) are the point
of intersection of the curve xy = 6 and y =  9-3x.

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