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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