Question

What is the equation in point-slope form of the line passing through (1, 9) and (–1, 11)?

Answer 1

slope = 11-9/ -1-1
= 2/-2
=-1
y-y1=m(x-x1) , m=-1 , (1,9)
y-9=-1(x-1)

Answer 2

y – 9 = 1(x + 1)
y + 9 = 1(x + 1)
y – 9 = –(x – 1)
y + 9 = –(x – 1)

Answer 3

y-9=-(x-1)