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avatar+115899 

Here is a question that I am stumped on.

 

I put the equation into Desmos and it really is two straight lines. frown

The angle between them appears to be always 90 degrees.

https://www.desmos.com/calculator/dvnoukkszg

 

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What is the equation of the two straight lines represented by the equation

\(ab (x^2-y^2) + (a^2-b^2)xy=0\)

 

Also, find the angle between them?  

 

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From the graph I can see that the lines are   y=mx  and y=-x/m

 

But how do I rearrange to get this?

 Sep 19, 2021
 #1
avatar+32828 
+4

As follows:

 

 Sep 19, 2021
 #2
avatar+115899 
0

Thanks very much Alan.

I understand perfectly now :)

Melody  Sep 19, 2021

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