Homework Help: Calc problem

Posted by Holly on Saturday, February 23, 2008 at 5:43pm.

Consider the function y=(kx)/(x-k)

a. Show that y is symmetric with respect to the line y=x.
b. Write the equations of the horizontal and vertical asymptotes of y.
c. Find the point(s) of intersection of y with the line x-y=-2k, and find the slope of the tangent line at the point(s) of intersection.

Please show step-by-step work in your answers. Thanks in advance!!! :)

Calc problem - Reiny, Saturday, February 23, 2008 at 6:03pm
a) take the inverse of your function and show that the original equation comes back at you.

b) for VA, the denominator is zero, so x-k = 0 is the vertical asymptote
for a HA, I visualize what happens to kx/(x-k) as x -- ∞

I see y = k

c) I solved y = kx/(x-k) with y = x+2k and got
x = ą k√2

put each of those values back into your straight line equation to get the corresponding y's.

take the derivative of the first function using the quotient rule, sub in the points you found to get the slope.

Now that you have the slope and the point, find the straight line equation of the tangent.

(I am assuming you know how to follow those steps)
Calc problem - Damon, Saturday, February 23, 2008 at 6:08pm
a)
the reflection matrix about the line y=x is
0 1
1 0
In other words, new x = old y
and new y = old x
So what happens if we do this operation on and x old = a and a y old = b? (a,b)
the original would be:
b = (ka)/(a - k)
find new x and new y if the symmetry exists (b,a)
a = (kb)/(b-k)
If that is true, we have the symmetry.
so solve for b
b a - k a = k b
b (a-k) = k a
b = (ka)/(a-k)

Answer this Question

Related Questions

Math - Is the following function symmetric with respect to the y-axis, symmetric...
Pre-Calc - Could somebody please check this for me? Dtermine whether the graph ...
Pre-Calculus-check answers - The graph of the equation y=x^3-x is symmetric with...
Pre Calc - Without actually graphing it, show that the graph of the equation x^3...
calc - Consider the following function. f(x) = 4x3 + x2 - 0.05x + 10 Find the ...
Pre-calculus - 1. The graph of the equation y = x2 – 3 is symmetric with ...
Math Analysis - Tell if the function is symmetric with respect to the x-axis, y-...
college calc - Give a formula for the function illustrated using a vertical ...
Calc. - Determine vector, parametric and, if possible, symmetric equations for ...
calculus - Determine whether the graph of the equation is symmetric with respect...

For Further Reading

First Name:
School Subject:
Answer: