Question

Which perpendicular?
y = - 4.
y- 6 = 5 (x+4) .
y = - 1/5 x + 2.
y = 3x + 3.

Answer 1

perpendicular means their slopes are opposite-reciprocals. first one has slope 0, second has slope 5 (point-slope form), third has slope -1/5 (slope-intercept), and the last has slope 3 (also slope-intercept).

Answer 2

I know what it means :) but do you know which are perpendicular?

Answer 3

the second and third are perpendicular
5 <=> -(5^(-1)) = -(1/5)

Answer 4

Thankx :)

Answer 5

No problem! :)