1. The problem statement, all variables and given/known data 2. Relevant equations None 3. The attempt at a solution Well guys, this is a problem I've been having for the last 2 days and with my midterm tomorrow I have no time to fiddle around with it. So, I do not understand how (where it says b) how Im going to use a division symbol ( / ) for indicating a break in the line. (3x+5y)[1 / -2] + (4x+7y)[-1 / 1] is equal to [-x-2y / -2x-3y] I have no understanding of this, because if you think of [x / y] which means it should be [(3(1) + 5(-2)) / (4(-1) + 7(1))] which is equal to [3x-10y / -4x+7y] which is not equal what the answer is. I hope you understand what I am asking and need a response asap, thanks in advance!