Posted by **jack** on Tuesday, January 25, 2011 at 2:34pm.

If line f is parallel to the line h, and line f has y-intercept 5, what is the equation of line f ? With h passing through two points (1, 2) and (3, 6)

- Math -
**helper**, Tuesday, January 25, 2011 at 2:42pm
REINY answered your earlier post and she said to try doing it yourself.

She did a similar example for you to follow. I pasted her example below.

Post your work if you get stuck.

Math - Reiny, Tuesday, January 25, 2011 at 12:09pm

slope of line through the two points = (6-2)/(3-1) = 2

so the slope of your new line = -1/2

since the slopes must be negative reciprocals of each other.

new equation:

y = (-1/2)x + b

but (2,2) lies on this

2 = (-1/2)(2) + b

3 = b

y = (-1/2)x + 3

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