Question 26686
For what value of 'c' is 'ax - by= c' a direct variation?
1 solutions

--------------------------------------------------------------------------------
Answer 14515 by venugopalramana(833)   on 2006-02-07 00:05:37 (Show Source): 

WE SAY X VARIES DIRECTLY AS Y IF X=K*Y,WHERE K IS A CONSTANT..HERE WE HAVE 
AX-BY=C..OR...AX=BY+C...OR...X=(BY+C)/A = (B/A)Y+(C/A)..BUT FOR DIRECT PROPORTION X=K*Y...HENCE C/A=0...OR...C=0