How to solve 5x-5y= -20 and what would be the value of x-y??? Please show step by step

x = y - 4

y = 4 - x

 

If you want a specific solution, like a number, there is not just one solution, for example..

x = 1     and     y = 5

 

or....

x = 0     and     y = 4

 

or....

x = -10     and     y = -6

 

Pick any number for x, and you can find one for y that will make the equation true (and vice versa).

 

So, there are infinitely many solutions to this.

 

The graph of all these solutions will be a straight line that will look like this:

 https://www.desmos.com/calculator/ars33alejx

 

Hope that made some sense! :)