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# Find the Vector Equation for the Line of Intersection of Two Planes

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Consider the planes 1x + 4y +3z = 1 and 1x + 3z = 0

(A) Find the unique point P on the y-axis which is on both planes. (0,1/4 ,0 )

(B) Find a unit vector with positive first coordinate that is parallel to both planes.
.94869 i + 0 j + -.3162 k

(C) Use parts (A) and (B) to find a vector equation for the line of intersection of the two planes,
? + 1/4 + ?

I need help find part c.

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vector equation for line of intersection of two planes
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Consider the planes 1x + 4y +3z = 1 and 1x + 3z = 0

(A) Find the unique ...

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###### Education
• BSc , Wuhan Univ. China
• MA, Shandong Univ.
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• "Your solution, looks excellent. I recognize things from previous chapters. I have seen the standard deviation formula you used to get 5.154. I do understand the Central Limit Theorem needs the sample size (n) to be greater than 30, we have 100. I do understand the sample mean(s) of the population will follow a normal distribution, and that CLT states the sample mean of population is the population (mean), we have 143.74. But when and WHY do we use the standard deviation formula where you got 5.154. WHEN & Why use standard deviation of the sample mean. I don't understand, why don't we simply use the "100" I understand that standard deviation is the square root of variance. I do understand that the variance is the square of the differences of each sample data value minus the mean. But somehow, why not use 100, why use standard deviation of sample mean? Please help explain."
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