You are given the line l:r=(1+2λ,−1−λ,3λ) , where λ is a parameter.
Which of the following statements are true?
The point (3,-2,3) lies on the line l
The vector (2,−1,3) is parallel to the line.
Line l is perpendicular to the line r=(2t,2−t,−1+3t) , where t is a parameter.
The equation of a plane containing line l and also passing through the point (0,2,−1) is 8x+y−5z=7 .
The vector (2,−1,3) is perpendicular to the line l .
1
Expert's answer
2021-10-18T07:14:55-0400
1.If the point (3, -2, 3) lies on the line l:r=(1+2λ,−1−λ,3λ), then (1+2λ=3)∧(−1−λ=−2)∧(3λ=3)
All three conditions is true when λ=1, so the point lies on the line l when λ=1
2.If the vector (2, -1, 3) is parallel to the line, then ∃t∈R:t∗(a,b,c)=(2,−1,3), where a, b, c - coefficients before λ for every coordinate
In our case: a = 2, b = -1, c = 3. So If the vector (2, -1, 3) is parallel to the line, then ∃t∈R:t∗(2,−1,3)=(2,−1,3). We have equility when t = 1, so vector (2, -1, 3) is parallel to the line
3.If two lines are perpendicular, the a1∗a2+b1∗b2+c1∗c2=0, where a1,b1,c1 and a2,b2,c2 are coefficients before parameters for every coordinate for first and second line
In our case: a1∗a2+b1∗b2+c1∗c2=2∗2+(−1)∗(−1)+3∗3=14=0→ lines aren't perpendicular
4.Firstly we find two points that belong to the line l
M1=(1,−1,0), when λ=0
M2=(3,−2,3), when λ=1
M3=(0,2,−1)
Now we have to find the equation of the plane that contains 3 points
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