did it show the number line she threw?
Part a: subtract 48-30=18
Part b: i found it by subtracting 48 -30 because it says left over
If y is the red marbles and x is the blue marbles, then for every x value you would be able to multiply by 2 to get the y value... it is the equivalent of looking at is as the slope rise/run or 2/1
D is the graph that shows this relationship. Look at the x value and multiply by 2 for the y value.
Y-2=1/4(x+8) is your answer
Explanation
Desmos