Write the equation of the line which passes through (2, 1) and is perpendicular to x = –2.

Question

anonymous · Answer

I don't get is 
-2 is slope?

anonymous · Answer

i dont understand it either :/...

anonymous · Answer

if x=-2 is linear 
than (2,1) can intercept ,can't not perpendicular ,

anonymous · Answer

It can be done.  X = -2 is simply suggesting the line is going up and down.  The perpendicular slope would be a horizontal line, or a slope of 0.
y-y1 = m(x-x1)
y-y1 = 0(x-x1)
Solve from there.

id21 · Answer

(2,1) means that x=2, y=1

If you need perpendicular line to x=-2, then you know that other line must be in form y=constant

so you can say that y=1 will be that line what you are looking for, because it is line which crosses the x=-2 at point (2,1)

I attach a picture to make it clear to you.

anonymous · Answer

Oh right.  Didn't think of id21's easier method. Since you know the slope is zero, that means you're going to solve y = ?
The "?" can be gotten straight from the y value of 2,1, which is 1.  

Clever thinking, bro!