Yahoo Answers: Answers and Comments for Write the equation of the line which passes through (2, 1) and is perpendicular to x = –2. (1 point)? [Mathematics]
Copyright © Yahoo! Inc. All rights reserved.
https://answers.yahoo.com/question/index?qid=20120701133045AAwPW1F
From Some
enUS
Sun, 01 Jul 2012 13:30:45 +0000
3
Yahoo Answers: Answers and Comments for Write the equation of the line which passes through (2, 1) and is perpendicular to x = –2. (1 point)? [Mathematics]
292
38
https://answers.yahoo.com/question/index?qid=20120701133045AAwPW1F
https://s.yimg.com/zz/combo?images/emaillogous.png

From Iggy Rocko: x = 2 is a vertical line so we want a horizon...
https://answers.yahoo.com/question/index?qid=20120701133045AAwPW1F
https://answers.yahoo.com/question/index?qid=20120701133045AAwPW1F
Sun, 01 Jul 2012 20:31:51 +0000
x = 2 is a vertical line so we want a horizontal line through (2, 1). That line is y = 1.

From Keith Roberts: Hi there 
Two things to keep in mind when...
https://answers.yahoo.com/question/index?qid=20120701133045AAwPW1F
https://answers.yahoo.com/question/index?qid=20120701133045AAwPW1F
Sun, 01 Jul 2012 20:52:51 +0000
Hi there 
Two things to keep in mind when solving these  first is how to find the equation of a line, given its slope and point on the line; second how to find the slopes of perpendicular lines.
In this problem, we need to recognize that the slope of x = 2 is undefined, as it's a vertical line. This means that its slope which is generally known to be the negative reciprocals (for defined nonzero numbers) ends up being zero for the case of a line with undefined slope. All this means is that lines perpendicular to a vertical line are always horizontal and, therefore, have slope m = 0.
Given this slope, now derive the equation of the line from slopeintercept form:
y = mx + b,
using m = 0, and the point (2,1) as an instance of x, y  to find b:
1 = 0*1 + b;
so b = 1.
Thus our equation is y = 0x + 1 or just y = 1.
I put together a short video tutorial which further illustrates this solution, and cited it as a source below. We hope it is helpful.

From Bob B: The line for the equation x = 2 is a vertical...
https://answers.yahoo.com/question/index?qid=20120701133045AAwPW1F
https://answers.yahoo.com/question/index?qid=20120701133045AAwPW1F
Sun, 01 Jul 2012 20:33:53 +0000
The line for the equation x = 2 is a vertical line that's drawn two units to the left of the yaxis.
A line perpendicular to that one must be horizontal.
A horizontal line passing through point (2, 1) has a constant y value of 1. Its equation is:
y = 1

From Brenda: because your line is x=2 , which is a vertica...
https://answers.yahoo.com/question/index?qid=20120701133045AAwPW1F
https://answers.yahoo.com/question/index?qid=20120701133045AAwPW1F
Sun, 01 Jul 2012 20:33:20 +0000
because your line is x=2 , which is a vertical line , then the perpendicular line to it has to be an horizontal line which means y=k
because the given point is (2,1) , then the line perpendicular to x=2 is y=1

From Alice Diaz Wright: Exactly what Iggy said!
https://answers.yahoo.com/question/index?qid=20120701133045AAwPW1F
https://answers.yahoo.com/question/index?qid=20120701133045AAwPW1F
Sun, 01 Jul 2012 20:32:57 +0000
Exactly what Iggy said!