Thursday

May 26, 2016
Posted by **Anonymous** on Wednesday, April 25, 2012 at 9:12pm.

- Algebra -
**Steve**, Thursday, April 26, 2012 at 12:09amline l has slope 3, so line k haas slope -1/3

using the point-slope form of a line,

(y-8) = -1/3 (x-5)

3y-24 = 5-x

3y = 29-x

so, if (2,y) is on the line,

3y = 29-2 = 27

y = 9

Or, without quite so much algebra, knowing that line k has slope 1/-3, we know that y increases by 1 when x decreases by 3.

going from (5,8) to (2,y), x has decreased by 3, so y increases by 1, from 8 to 9.