Slope is the how much the graph grows by. to find slope you can find the rise/run which is like looking at a graph a drawing a triangle on the box and you put how many boxes they rise by and you put that over run. if you need more help just search up rise over run and it’ll give you more on what im talking about i hope this helps you!!
I believe it would take 10 cups. The reason being 4 cups of 1/4 equals 1 so double it to 8 and add 2 more cups to make 2/4. So add 8 plus 2 and get 10.