Answer:

Step-by-step explanation:
The line is shown in the attachment.
The slope of this line is given by: 
The line passes through (0,1) and (1,5)
Plug in the points to get:

The equation of this line is given by
, where b=1 is the y-intercept.
From the graph the y-intercept is 1, because the line intersects the y-axis at (0,1).
Therefore the equation is 
Stevie has 25marbles
Freddie's has 25x2:50marbles
Danny has 50+5:55marbles
Answer:. ... .
Step-by-step explanation: