Question

In question 10/X+y +2/x-y=4 ;15/X+y -5/x-y=-2 why did you multiple 1eq by -5 you can multiple it by 5

Answer 1

x=3 & y=2 is your answer

Answer 2

Yes we can multiply by 5 too but then instead of adding the two euations we have to subtract them

So the logic remains the same 

We r still eliminating one of the terms and finsing the other one.