Question

You know the slope and one point on a line that is not the y‑intercept. Why might you write the equation in point-slope form instead of slope-intercept form?

Answer 1

I think either way is correct.

For a point (a, b), and slope m:

point-slope form: y - b = m(x - a)

slope-intercept form: b = ma + c, where c is the y-intercept.