3: One way to try to determine the line of intersection of two planes in 3-space is to find two points of intersection. Once you have two points, the line through them must be the line of intersection. To find two such points, it may help to search for points that are in both planes and have one of the coordinates x, y, or z equal to zero. (a) Explain the geometric idea behind this method. (Visualize and think..)

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
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ISBN:9780079039897
Author:Carter
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Chapter9: Quadratic Functions And Equations
Section9.7: Solving Systems Of Linear And Quadratic Equations
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HW Problem 3: One way to try to determine the line of intersection of two planes in 3-space is
to find two points of intersection. Once you have two points, the line through
them must be the line of intersection. To find two such points, it may help to
search for points that are in both planes and have one of the coordinates x, y, or z
equal to zero.
(a) Explain the geometric idea behind this method. (Visualize and think...)
(b) Use this method to find the line of intersection of the plane x + 2y + 3z =
and the plane x + y + z = 3. Express the line of intersection using parametric
equations.
(c) If two planes intersect, is it guaranteed that the method of setting one of the
variables equal to zero to find a point of intersection always find at least two
points at which the planes intersect? Explain.
Hint: What, geometrically, does it mean when you set x = 0, y = 0, or z = 0?
Transcribed Image Text:HW Problem 3: One way to try to determine the line of intersection of two planes in 3-space is to find two points of intersection. Once you have two points, the line through them must be the line of intersection. To find two such points, it may help to search for points that are in both planes and have one of the coordinates x, y, or z equal to zero. (a) Explain the geometric idea behind this method. (Visualize and think...) (b) Use this method to find the line of intersection of the plane x + 2y + 3z = and the plane x + y + z = 3. Express the line of intersection using parametric equations. (c) If two planes intersect, is it guaranteed that the method of setting one of the variables equal to zero to find a point of intersection always find at least two points at which the planes intersect? Explain. Hint: What, geometrically, does it mean when you set x = 0, y = 0, or z = 0?
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