Saturday, July 12, 2014

`(0, 2) , y'=x/(4y)` Find an equation of the graph that passes through the point and has the given slope.

We need to find the equation of the graph that passes through the point (0,2). The slope of the tangent line to the graph of y(x) is the derivative y' and it is given by the equation


`y' = x/(4y)` .


This equation can be solved by the method of separating variables. First, rewrite


`(dy)/(dx) = x/(4y)` .


Now, multiply by 4y and dx:


`4ydy = xdx`


Now both sides can be integrated:


`4y^2/2 = x^2/2 + C` . Here, C is an arbitrary constant.


From here,


`4y^2 = x^2 + 2C`


Since the graph of the equation has to pass through the point (0, 2), we can find C:


`4*2^2 = 0 + 2C`


C = 8.


So the equation of the graph is


`4y^2 = x^2 + 16` , which can also be written as


`y^2/4 - x^2/16 = 1` . This is a hyperbola that opens up and down, with the vertices at the points (0, 2) and (0, -2).


`y^2/4 = x^2/16 + 1`


` y^2 = x^2/4 + 4`


` y = +-sqrt(x^2/4 + 4)`

No comments:

Post a Comment

Thomas Jefferson's election in 1800 is sometimes called the Revolution of 1800. Why could it be described in this way?

Thomas Jefferson’s election in 1800 can be called the “Revolution of 1800” because it was the first time in America’s short history that pow...