Equation of a line

How do you fine the equation of a line?
~Find the equation of each line described below. Show all subproblems.
a) The line through points (-1,4) and (2, 1)
b) The line through points (6,3) and (5,5)
c) The line with slope 1/3 through the point (0,5)
d) The line parallel to y= 2x-5 through point (1,7)

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