For each of the following pairs of equations, find the point of intersection by adding the two equations together. Remember: you might need to change the coeffients and/or signs of the variables before adding.
Help!
x-y = -1
x+y= 9
Okay? What I don't understand is how you got the -1 and why you have the x - y (x+y)... I don't understand what the reasoning is behind that. Could you explain that to me?
Thanks so much for helping me... I AM getting the same answer but not really understanding the way I'm getting it.. make sense? LOL
Thanks again!!!