It must be ≤ instead of ≥.
y ≤ - 3·x + 4
If you calculate 240/48, you will get 5 without any remainder, which means if you get 5 buses it can exactly take all students?
He put in 1 extra cup because the recipe only needed 3. 4-3=1.
Well, we know that the two consecutive numbers have to be negative, because if it was positive, the smaller number multiplied by two would be much greater. (unless 1 and 2). So, by guessing and checking, we will get -13 and -14 :)
