Answer:
y=-12
Explanation:
For the slope of line given two points I like to line up and subtract. Then put 2nd diff/1st diff.
Let's do that:
(-6 , -12 )
(0 , -12)
-----------
-6 0
2nd/1st=0/-6=0 slope should have been obvious as 0 since there is no rise in the points (you can see this from their y-coordinate)
Anyways the y-intercept is when it crosses the y-axis. The y-axis is crossed when the x-coordinate is 0. You have that given here which is -12.
So the equation is y=0x-12 or jusy y=-12
If you already knew that horizontal lines were of the form y=a number
then you could have just skip to y=-12
y=-12 just means all the ordered pairs on this line have the y-coordinate being -12 which is what we have in the set of points you gave