Write the equation of each line using the given information.
a. the points (-4,1) and (2, 4) both lie on the line
b. m = -1 and the point (2, -1) lies on the line.
c. it has the same slope as y = 5 and passes through (1,1).
d. m = -3 and it has a y-intercept of (0,8).