Question

write the equation of the horizontal line that passes through the point (-2, -2)

Answer 1

horizontal lines have equation of the form

y=c

where 'c' is the y co-ordinate of any point on it.

so what is the y co-ordinate in (-2,-2) ?

Answer 2

it doesnt say

Answer 3

a horizontal line is represented by " y = a number ".
your points are always set up as (x,y)
(-2,-2)....x = -2 and y = -2

so your equation is : y = -2 (because the number in the y spot is -2)