- #1

rocapp

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## Homework Statement

Which of these three points falls on the line?

l: r(t)=(i+2j)+t(6i+j-5k)

P(1,2,0); Q(-5,1,5); R(-4,2,5)

I have the answer, but I don't understand why P and Q fall on the line but R does not. Is it because the i and j magnitudes are different for R?

## Homework Equations

## The Attempt at a Solution

P:

(1+6t) = 1

t=0

2=2+t

t=0

t=0

Q:

-5=1+6t

t=-1

1=2+t

t=-1

t=0

R:

-4=1+6t

t=-5/6

2=t+2

t=0

t=0