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Starter – mix and match the following. Inconsistent. Exactly the same planes. Parallel planes. Dependent. Many solutions. No solutions. Like flying carpets. Mix and match answers. Dependent. Many solutions. Exactly the same planes. Inconsistent. No solutions. Parallel planes.

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starter mix and match the following
Starter – mix and match the following

Inconsistent

Exactly the same planes

Parallel planes

Dependent

Many solutions

No solutions

Like flying carpets

mix and match answers
Mix and match answers

Dependent

Many solutions

Exactly the same planes

Inconsistent

No solutions

Parallel planes

Like flying carpets

recap from yesterday
Recap from yesterday
  • Unique – one solution
  • Same planes (dependent – many solutions)
  • All 3 parallel – magic carpets (inconsistent – no solutions)
  • 2 planes parallel and one cuts through them – ninja styles (inconsistent – no solutions)
order to do things
Order to do things:
  • Always check for parallel planes first
  • If all 3 are parallel, you have magic carpets.
  • If only 2 are parallel, you have ninja styles
  • But, you might get solutions that are neither of these…
5 planes intersect along a common line the book
5) Planes intersect along a common line – The book
  • Many solutions
  • All three planes intersect along a common line.
  • We can say the equations are dependent.

The answers you will get for x, y and z can change, they will depend on what one of the variables is.

slide6

Dependent

5) The book

6x + 9y - 27z = 48

6x + 2y - 2z = 24

6x - 12y + 48z = -24

Three planes intersect along a common line, so you get many solutions

slide7

Dependent

5) The book

6x + 9y - 27z = 48

6x + 2y - 2z = 24

6x - 12y + 48z = -24

Three planes intersect along a common line.

To find where pairs of planes intersect, we take 2 planes at a time and try to eliminate one of the variables.

In this case, the x variable is the easiest to eliminate as they have the same coefficient

slide8

Dependent

5) The book

To find where pairs of planes intersect, we take 2 planes at a time and try to eliminate one of the variables.

6x + 9y - 27z = 48

To eliminate the 6x, we want to subtract one equation from the other

6x + 2y - 2z = 24

6x - 12y + 48z = -24

7y - 25z = 24

slide9

Dependent

5) The book

To find where pairs of planes intersect, we take 2 planes at a time and try to eliminate one of the variables.

6x + 9y - 27z = 48

To eliminate the 6x, we want to subtract one equation from the other

6x + 2y - 2z = 24

6x - 12y + 48z = -24

Then take the other 2 equations and eliminate the 6x by subtracting one equation from the other

7y - 25z = 24

14y - 50z = 48

Remember, these are the lines that the pairs of equations intersect along. If these lines are the same, then you have a book

slide10

Dependent

5) The book

To find where pairs of planes intersect, we take 2 planes at a time and try to eliminate one of the variables.

6x + 9y - 27z = 48

Remember, these are the lines that the pairs of equations intersect along. If these lines are the same, then you have a book

6x + 2y - 2z = 24

6x - 12y + 48z = -24

So are they the same line?

7y - 25z = 24

The second equation can be divided through by 2 to give the first equation. So we have a book.

14y - 50z = 48

6 the lines where the planes intersect are parallel to each other the tent
6) The lines where the planes intersect are parallel to each other – The tent
  • No solutions
  • These planes never intersect
  • We can say the equations are inconsistent.
6 the tent
6) The tent

15x + 5y + 20z = 500

5x + 5y + 5z = 375

-5x + 5y + -10z = 0

Starts out like a book, but with the bottom plane moved up. The 3 planes no longer intersect along the same line

The intersections of 2 planes at a time are all parallel (Tent)

6 the tent1
6) The tent

To find where pairs of planes intersect, we take 2 planes at a time and try to eliminate one of the variables.

In this case, the y variable is the easiest to eliminate as they have the same coefficient

15x + 5y + 20z = 500

To eliminate the 5y, we want to subtract one equation from the other

5x + 5y + 5z = 375

-5x + 5y + -10z = 0

10x + 15z = 125

6 the tent2
6) The tent

To find where pairs of planes intersect, we take 2 planes at a time and try to eliminate one of the variables.

In this case, the y variable is the easiest to eliminate as they have the same coefficient

15x + 5y + 20z = 500

To eliminate the 5y, we want to subtract one equation from the other

5x + 5y + 5z = 375

-5x + 5y + -10z = 0

Then take the other 2 equations and eliminate the 6x by subtracting one equation from the other

10x + 15z = 125

10x + 15z = 375

6 the tent3
6) The tent

To find where pairs of planes intersect, we take 2 planes at a time and try to eliminate one of the variables.

So this is a tent!

Because the equations are the same except for the constant

15x + 5y + 20z = 500

5x + 5y + 5z = 375

-5x + 5y + -10z = 0

Remember, these are the lines that the pairs of equations intersect along.

10x + 15z = 125

If these lines are the same, then you have a book

10x + 15z = 375

If they are parallel to each other, you have a tent.

recap from today
Recap from today:

If the lines are not parallel:

  • Eliminate one of the variables.
  • This gives you the equation of where pairs of your planes intersect.

- If these lines are the same, you have a book

(many solutions and dependent)

- If these lines are parallel, you have a tent

(no solutions and inconsistent)

practice 1
Practice 1
  • Eliminate one variable from this set of equations and determine whether you have a book or a tent
practice answer
Practice answer
  • That was a book (the lines where the pairs of planes intersect are the same, so we have many solutions and they are dependent)

It isn’t obvious whether these are the same equation or parallel, so we can put them in the form y = mx + c

practice 2
Practice 2
  • Eliminate one variable from this set of equations and determine whether you have a book or a tent
answers to practice 2
Answers to practice 2

Inconsistent (no solutions)

recap the steps you have 3 equations what type of solution are they
Recap the steps: You have 3 equations, what type of solution are they?

If it is not unique, complete the following:

  • Check if they are parallel - Make the coefficients of one of the variables the same. If everything else is the same, except the constant, then they are parallel. You have magic carpets (inconsistent and no solutions)
  • If two of them are parallel, but the third isn’t, then you have ninja styles (inconsistent and no solutions)
  • If they are not parallel, you either have tents or books. So they either intersect along a line, or the intersection of 2 planes is parallel to the third.
recap the steps you have 3 equations what type of solution are they1
Recap the steps: You have 3 equations, what type of solution are they?

If it is not unique, complete the following:

4) Eliminate one of the variables, so that you only get two equations with two variables. These two equations are the lines that two of the planes intersect along.

  • If these equations are the same, then you have a book – they intercept along the spine of the book (dependent and many solutions).
  • If these two equations are parallel – the same except for the constant, then you have a tent (inconsistent and no solutions)
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