d2jsp
Log InRegister
d2jsp Forums > Off-Topic > General Chat > Homework Help > High School Precalc
Add Reply New Topic New Poll
Member
Posts: 15,287
Joined: Nov 12 2011
Gold: 364.00
Jan 7 2014 09:00pm
This is review homework so Im missing something lol

Find a relationship between x and y such that (x, y) is equidistant from the 2 points

81. (4.-1) (-2,3)

Answer is 3x-2y-1
Member
Posts: 32,925
Joined: Jul 23 2006
Gold: 3,804.50
Jan 7 2014 09:26pm
Quote (drhong @ Jan 7 2014 10:00pm)
This is review homework so Im missing something lol

Find a relationship between x and y such that (x, y) is equidistant from the 2 points

81. (4.-1) (-2,3)

Answer is 3x-2y-1


you make a typo in the answer? that's an expression, not a relationship.

not entirely sure i understood the question, but since you have 2 points you just need to connect them via a line segment, then (x,y) is the midpoint. x = (-2+4) / 2 and y = (3 + -1) / 2

This post was edited by carteblanche on Jan 7 2014 09:29pm
Member
Posts: 15,287
Joined: Nov 12 2011
Gold: 364.00
Jan 7 2014 09:37pm
Quote (carteblanche @ Jan 7 2014 08:26pm)
you make a typo in the answer? that's an expression, not a relationship.

not entirely sure i understood the question, but since you have 2 points you just need to connect them via a line segment, then (x,y) is the midpoint. x = (-2+4) / 2 and y = (3 + -1) / 2


Uhm, = 0? Lol. That's what's in the book :?

Member
Posts: 32,925
Joined: Jul 23 2006
Gold: 3,804.50
Jan 7 2014 09:44pm
Quote (drhong @ Jan 7 2014 10:37pm)
Uhm, = 0? Lol. That's what's in the book :?


ok so that's a line. that makes more sense now. so basically it wants all points (x,y) that are equadistant. which means you want a line that's perpendicular to the given line, and intersects at the midpoint. from my above post you know the midpoint is (1,1). and you know the slope of the given line (-6/4). so the slope of a line perpendicular is 4/6 = 2/3. so just put that in whatever form you like, i recommend point slope form since it's easiest:

y - 1 = 2/3 (x - 1)

This post was edited by carteblanche on Jan 7 2014 09:47pm
Member
Posts: 15,287
Joined: Nov 12 2011
Gold: 364.00
Jan 7 2014 09:49pm
Oh, then you clear up the fractions and get the answer. Thanks :D

I'm gonna be posting in here at least once a week since pre-calc is all about
new stuff (mostly trig at my school)
Go Back To Homework Help Topic List
Add Reply New Topic New Poll