Answer:
The value of m to be substituted in y – y1 = m(x – x1) is the negative reciprocal of the slope of the given line.
Substitute this in for m.
Substitute the given point, (x1, y1), in the point-slope form.
Isolate y by multiplying out m and subtracting y1 to rewrite the equation in slope-intercept form: y = mx + b.
It should be something like this, hope this helped you!