Answer to Question #222321 in Analytic Geometry for mike

Question #222321

A line passes through the points (7,-4,8) and (9,0,5)

i) Determine the parametric and symmetric equations of the line

ii)Find any other point on the line

iii)Show that the line does not pass through the origin



1
Expert's answer
2021-08-16T15:34:49-0400

i) The collinear vector of a line is v=(97,0(4),58)=(2,4,3).\overline{v}=(9-7,0-(-4),5-8)=(2,4,-3). Then the symmetric equation of the line is

x72=y+44=z83.\frac{x-7}{2}=\frac{y+4}{4}=\frac{z-8}{-3}.

It follows that the parametric equation of the line is

{x=7+2ty=4+4tz=83t.\begin{cases}x=7+2t\\y=-4+4t\\z=8-3t\end{cases}.


ii) For t=1t=-1 we have that

x=7+2(1)=5, y=4+4(1)=8, z=83(1)=11.x=7+2(-1)=5,\ y=-4+4(-1)=-8,\ z=8-3(-1)=11.

Then the point (5,8,11)(5,-8,11) is on the line.


iii) If y=0,y=0, then 4+4t=0,-4+4t=0, and hence t=1.t=1. On the other hand for t=1,t=1, we have that x=90,x=9\ne 0, and hence the line does not pass through the origin.


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