First, I added them up. From the things we know, blue, red, green, yellow combined equals 16 marbles. 20-16 equals 4. So there are 4 white marbles. 4/20 times 5 equals 20/100. So the percent of the marbles that are white is 20%.
= to because the graph has a y int at 1 and so does your formula given (just make x=0 to find it by plugging that in) and that one has a y int at 1 too
