When you subtract you are taking away a number but also when you distribute -1 to a number it will take away 1 (because it’s negative) :-) hope this made sense!
In proportional, it is y/x=k or y=kx
basically it is like y=mx+b, it is a line
What i do know is it that its not c, or d its to high and it is a or b.
The number 7 should be removed from his list to make the list accurate.
