Question

Write an equation for a line that is parallel to the equation y= -9. The line must pass through the points (4, -11). How do I do this?

Answer 1

I should get `y=-11`

Explanation:

In this cas you are lucky...your original line is perfectly horizontal (slope `=0`)!!!
So, to be parallel you need another horizontal line that passes through `-11` i.e.:
`y=-11`

In general you can write the equation of a line as:
`y=mx+c`
where:
`m=` slope
`c=` y-intercept
so here you need:
slope `=m=0`
y-intercept `=c=-11`