Note: If you write your equations across your paper, then the work can just flow down the paper. It makes it so much easier to show the work you have done. OK?
-5 is bigger than -9 because they are negative numbers so they go opposite ways on the number line so the concept of normal number backwards. hope this helps
The equation you can use is x + 3x = 428 with x as the number of cheeseburgers and 3x the number of hamburgers you solve for x and get 4x= 428 and x=107