The scatter plot below shows the relationship between hours spent on video games and hours spent on homework last week for students in Ginnys class. Which of the following is the best estimate of the average change in homework time that was associated with a 1 hour increase in time spent on video games?

So it is input is t and output is d(t)
so in normal terms it could be like this
y=mx
y is output
x is input

y is dependend variable
x is independent variable
basically it is
y=35x

normally ordered pairs are written as
(x,y)
so just subsitute values for x and get values for y ( or in this case the point is (t,d( so subsitute values for t and get outputs of d(t))

ex.
if you put 1 for t then you get
d(1)=35(1)
d(1)=35
so the point would be (1,35)
if t=0
d(0)=35(0)
d(0)=0
another point would be (0,0)