If distinct planes r and s are both perpendicular to line l , which is always true?
1. plane r is parallel to plane s
2. plane r is perpendicular to plane s
3. planes r and s and line l are all parallel
4. the intersection of planes r and s is perpendicular to line l

Option 1 is correct.

Step-by-step explanation:

Let there is a line A which is perpendicular to line L at point O.

Now, rotating line A about point O by 360° will give the plane R.

So, plane R is perpendicular plane to line L.

Again, let there is a line B which is perpendicular to line L at point P.

Now, rotating line B about point P by 360° will give another plane S.

So, plane S is perpendicular plane to line L.

Since line A and line B are parallel (As they are perpendicular to the same line L) so, plane R containing line A and plane S containing line B will also be parallel to each other.  

Hence, option 1 is correct. (Answer)

in simplified version   it would be x ≤-4

step-by-step explanation:

multiply each term in x ≤-4 by -1