First let's try some refreshers from algebra in the t-y plane.
a. What is the slope of the straight line in the plane connecting (1, 1) to (3, 4)?
b. What is the slope of the straight line connecting (t0, y0) to (t1, y1)?
c. What is the equation of the straight line connecting (1, 0) to (0, 1)?
d. What is the equation of the straight line connecting (1, 0) to (3, 0)?
e. What is the equation of the straight line connecting (1, 0) to (1, 3)?