Question

what is the slope of a line that is perpendicular to 3y+x=21?
1. -3
2. -1/3
3. 0
4. 1/3
5. 3

Answer 1

Well first, what do you get for the slope of that original line? Then you can find the perpendicular slope

Answer 2

-1/3 is the slope of the original line.

Answer 3

So to find the perpendicular slope you take the reciprocal of that and change it's sign.

Answer 4

thx