find the equation of the line containing the given pair of points (-7,-2) and (-4,-3)
first find the slope: A(-7,-2) B(-4,-3) I assigned letters to keep track of the points.
M = yA - yB/ xA - xB
M = -2 - (-3) / -7 - (-4) = 1/-3 or -1/3
use point A to make the equation of the line
y - (-2) = -1/3x - (-7)
y + 2 = -1/3x + 7
y = -1/3x + 5