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In 5x-5y=-20 doesnt x= -4 and y = 4?????

so if I needed to know x-y it would be -4-4 which is -8?? So why does it say in my book that x-y = -4 ???

Guest May 30, 2017
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5x - 5y  =  - 20     divide through by 5

 

x  -  y   =   -4

 

This is the equation of a line.......there are infinite values that make this true...for example

 

( x, y )  =   ( 0, 4)  =  ( 4, 8)  =  (-4, 0 )   .....etc.

 

 

 

cool cool cool

CPhill  May 30, 2017

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