Point-slope form is
y - ysub1 = m ( x - xsub1) where x and y are variables, and xsub1 and ysub1 are values from a given ordered pair, from a given point.
After substituting, distribute on the right and move -ysub1 from the left side to the right side. This isolates y on the left and leaves a slope times x term and a y-intercept term on the right.
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