Hi all, I'm working on this problem and for some reason, seem to keep getting stuck in a loop of wrong answers.

So we're given:

x + y = 1, 0.7x + 0.2y = x, and 0.3x + 0.8y = y

I'm instructed to multiply the terms by 10 to simplify, and to combine the like terms in order to solve:

___x + 2y = 0

and

___x - 2y = 0

The answer is -3 and 3, but I don't know how to arrive at that.

Any help will be much appreciated!