What is the equation of the line through the point (2, 3) with slope –2?

Answer 1

y-k = m(x-h)
is called the point-slope form for a reason.

Answer 2

y - y1 = m (x - x1)
y - 3 = -2 (x - 2)
y - 3 = -2x + 4
y - 3 + 3 = -2x + 4 + 3
y = -2x + 7