# Algebra Examples

Find the Intersection of the Line Perpendicular to Plane 1 Through the Origin and Plane 2
,
Get each plane equation in standard form.
Move to the left side of the equation because it contains a variable.
Move to the left side of the equation because it contains a variable.
Move to the right side of the equation because it does not contain a variable.
To find the intersection of the line through a point perpendicular to plane and plane :
1. Find the normal vectors of plane and plane where the normal vectors are and . Check to see if the dot product is 0.
2. Create a set of parametric equations such that , , and .
3. Substitute these equations into the equation for plane such that and solve for .
4. Using the value of , solve the parametric equations , , and for to find the intersection .
Find the normal vectors for each plane and determine if they are perpendicular by calculating the dot product.
is . Find the normal vector from the plane equation of the form .
is . Find the normal vector from the plane equation of the form .
Calculate the dot product of and by summing the products of the corresponding , , and values in the normal vectors.
Simplify the dot product.
Remove parentheses.
Simplify each term.
Multiply by to get .
Multiply by to get .
Multiply by to get .
Simplify by subtracting numbers.
Subtract from to get .
Next, build a set of parametric equations ,, and using the origin for the point and the values from the normal vector for the values of , , and . This set of parametric equations represents the line through the origin that is perpendicular to .
Substitute the expression for , , and into the equation for .
Solve the equation for .
Simplify the left side.
Simplify each term.
Multiply by to get .
Rewrite as .
Multiply by to get .
Subtract from to get .
Subtract from to get .
Divide each term by and simplify.
Divide each term in by .
Simplify the left side of the equation by cancelling the common factors.
Reduce the expression by cancelling the common factors.
Factor out of .
Cancel the common factor.
Rewrite the expression.
Move the negative one from the denominator of .
Simplify the expression.
Multiply by to get .
Rewrite as .
Divide by to get .
Solve the parametric equations for , , and using the value of .
Solve the equation for .
Multiply by to get .
Subtract from to get .
Solve the equation for .
Multiply by to get .
Solve the equation for .
Simplify each term.
Multiply by to get .
Multiply by to get .
The solved parametric equations for , , and .
Using the values calculated for , , and , the intersection point is found to be .

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