Each marble bad sold by diane's marble company contains 4 yellow marbles for every 5 blue marbles. if a bag has 30 blue marbles, how many yellow marbles does it contain?

The answer would be 24 yellow marbles

30/5=6
6*4=24

Y= 4/5 x + 24
To find the rate of change you find the difference in each of the numbers on the graph. For example, 36-32 is 4. So 28-4 is 24 and that would be the next number down. It would also match x to be 0 because since the rate of change for x was 5, if you subtract 5 from 5 you get 0. So from this we know that the coordinates would be 0,5.
From this info, the slope would be 4/5 and the y intercept or initial value would be 24