Sunday, April 6, 2014

the graphs of the equations xy=16 and y=x are drawn on the same set of axes. In which quadrant or quadrants will they intersect?

Given the curves:


xy
=16


Then we will rewrite as a function of
x.


==> y= 16/x
...........(1)


And the curve
:


y= x...............(2)


We
need to find the intersections points .


==> y=
y


==> x = 16/x


We will
multiply by x.


==> x^2 =
16


==> x = +-4


Then, we
have two intersection points at x1= 4 and x2= -4


Now we
will find the y-coordinate.


==> y1= x1=
4


==> y2= x2= -4


Then,
the points of intersection are :


(4,4) and
(-4,-4)


The point (4,4) is located in the
first quadrant and the point (-4,-4) is located in the third
quadrant.

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