Question

Practice writing equations given the slope and a point.
What is the point-slope form of a line that has a slope of 3 and passes through the point (–1, 4)?
y – (–1) = 5(x – 4)
4 – y1 = 3(–1 – x1)
y – 3 = –1[(x – (–4)]
y – 4 = 3[(x – (–1)]

Answer 1

The correct choice is the last one:

y − 4 = 3(x − (−1)),

which simplifies to y − 4 = 3(x + 1). (Equivalently y = 3x + 7.)