Please include your question in the body of your post .. not just in the title :/
x-y=5 (1a) becomes x=5+y (1b)
-4x+4y=20 (2a) becomes -x+y=5 becomes x=y-5 (2b)
Put these together and we get
5+y=y-5
That is never going to happen :(
So there are no solutions. Yes it is very sad :((
Please include your question in the body of your post .. not just in the title :/
x-y=5 (1a) becomes x=5+y (1b)
-4x+4y=20 (2a) becomes -x+y=5 becomes x=y-5 (2b)
Put these together and we get
5+y=y-5
That is never going to happen :(
So there are no solutions. Yes it is very sad :((