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2022 POI equations.notebook November 19, 2013 p.20 Define: Point of Intersection (P.O.I) Where the (x, y) are the same for two different equations. How do you find P.O.I. using the equations ? LT 2b: I can find the point of intersection (P.O.I.) between two equations using their equations . y =2x +1 y = 2x +9 1. 2. 3. 4. 5. 6. Example 1: Find the POI: y =2x +1 y = 2x +9 Find the POI: y =4 x 12 y = 2( x 4x) Simplifyif needed (distribute, like terms) Stopchopchop add/sub smallest variable from both sides. use inverse operations to solve equation. { { unit 4 Example 2:
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20-22 POI equations.notebook - ISD 622 · 2013. 11. 19. · Solve and check. 2 4 ... 13 Shen23Shen 47 67 811 Shen Shen Shen Shen 1516 16 1719 1819 Shen Shen 2022 2122 Shen Shen Shen

Sep 20, 2020

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Page 1: 20-22 POI equations.notebook - ISD 622 · 2013. 11. 19. · Solve and check. 2 4 ... 13 Shen23Shen 47 67 811 Shen Shen Shen Shen 1516 16 1719 1819 Shen Shen 2022 2122 Shen Shen Shen

20­22 POI equations.notebook November 19, 2013

p.20

Define:Point of Intersection (P.O.I)

Where the (x, y) are the same for two different equations.

How do you find P.O.I. using the equations?

LT 2b:  I can find the point of intersection (P.O.I.)              between two equations using their equations.

y = 2x + 1 y = ­2x + 9

1.2.3.4.5.6.

Example 1:

Find the POI:

y = 2x + 1y = ­2x + 9

Find the POI:

y = 4x ­ 12 y = 2(x ­ 4x)

Simplify­if needed (distribute, like terms)Stop­chop­chop

add/sub smallest variable from both sides.use inverse operations to solve equation.

{

{

unit 4

Example 2:

Page 2: 20-22 POI equations.notebook - ISD 622 · 2013. 11. 19. · Solve and check. 2 4 ... 13 Shen23Shen 47 67 811 Shen Shen Shen Shen 1516 16 1719 1819 Shen Shen 2022 2122 Shen Shen Shen

20­22 POI equations.notebook November 19, 2013

Find the POI:

Summary:

p.21

CW P

y = 25x + 200y = 50x + 50{

For 1­6, find the point of intersection.

1. 2.

y = ­2(3 ­ x)y = 3(4x + 1)

y = ­3 + 6xy = 3(5 ­ x){

p.21­22 (1, 2, 3, 8) p.21­22 (all)

{unit 4

Example 3:

Page 3: 20-22 POI equations.notebook - ISD 622 · 2013. 11. 19. · Solve and check. 2 4 ... 13 Shen23Shen 47 67 811 Shen Shen Shen Shen 1516 16 1719 1819 Shen Shen 2022 2122 Shen Shen Shen

20­22 POI equations.notebook November 19, 2013

Does studying matter?

y = 4xy = ­10x ­ 28{ y = 6 ­ 2x

y = 3(2x + 4){

y = 3x + 5 + 2xy = 5(2x + 1){ y = 2 ­ 4(x ­ 4)

y = 10(2x ­ 3){5. 6.

p.223. 4.

Remembering

7.

a) Draw a fitted a line.

b) How many ice cream cones are predicted to sell if it's 82 degrees?  Show or explain your answer.

8.

a) Draw a fitted a line.

b) What kind of correlation does the graph have? Explain your answer.

unit 4

Page 4: 20-22 POI equations.notebook - ISD 622 · 2013. 11. 19. · Solve and check. 2 4 ... 13 Shen23Shen 47 67 811 Shen Shen Shen Shen 1516 16 1719 1819 Shen Shen 2022 2122 Shen Shen Shen

20­22 POI equations.notebook November 19, 2013

IF Checking:

Simplify. Solve and check.

2 ­ 4(2x ­ 4) 2(  x ­ 3) = 413

Box 7 p.18­19parent signature

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20­22 POI equations.notebook November 19, 2013

Company A Equation

         m = _________          b = _________           Eq: _______________

Company B Equation

         m = _________          b = _________           Eq: _______________

p.19 answer

• Circle the point of intersection in the table.• Label the point of intersection in the graph.

• Now, find the point of intersection using the equations.

• At how many hours will Company A and B cost the same to rent a boat?

• How much will it cost at this time?

Page 6: 20-22 POI equations.notebook - ISD 622 · 2013. 11. 19. · Solve and check. 2 4 ... 13 Shen23Shen 47 67 811 Shen Shen Shen Shen 1516 16 1719 1819 Shen Shen 2022 2122 Shen Shen Shen

20­22 POI equations.notebook November 19, 2013

1­3 2­3Shen Shen4­7 6­7

8­11Shen ShenShen Shen

15­16 1617­19 18­19

Shen Shen

20­22 21­22Shen ShenShen Shen

12­14 12­14

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20­22 POI equations.notebook November 19, 2013

p.20

Define:Point of Intersection (P.O.I)

Where the (x, y) are the same for two different equations.

How do you find P.O.I. using the equations?

LT 2b:  I can find the point of intersection (P.O.I.)              between two equations using their equations.

y = 2x + 1 y = ­2x + 9

1.2.3.4.5.6.

Example 1:Find the POI:

y = 2x + 1y = ­2x + 9

Simplify­if needed (distribute, like terms)Stop­chop­chop

add/sub smallest variable from both sides.use inverse operations to solve equation.

{

unit 4

1.  Ignore the y and set equations equal to each other. 

6.  plug x into original equations to find y.

Page 8: 20-22 POI equations.notebook - ISD 622 · 2013. 11. 19. · Solve and check. 2 4 ... 13 Shen23Shen 47 67 811 Shen Shen Shen Shen 1516 16 1719 1819 Shen Shen 2022 2122 Shen Shen Shen

20­22 POI equations.notebook November 19, 2013

Find the POI:

y = 4x ­ 12 y = 2(x ­ 4x){

Example 2:

Page 9: 20-22 POI equations.notebook - ISD 622 · 2013. 11. 19. · Solve and check. 2 4 ... 13 Shen23Shen 47 67 811 Shen Shen Shen Shen 1516 16 1719 1819 Shen Shen 2022 2122 Shen Shen Shen

20­22 POI equations.notebook November 19, 2013

Find the POI:

p.21

y = ­2(3 ­ x)y = 3(4x + 1){

unit 4

Example 3:

Page 10: 20-22 POI equations.notebook - ISD 622 · 2013. 11. 19. · Solve and check. 2 4 ... 13 Shen23Shen 47 67 811 Shen Shen Shen Shen 1516 16 1719 1819 Shen Shen 2022 2122 Shen Shen Shen

20­22 POI equations.notebook November 19, 2013

Summary:

Find x.  Don't forget to find y.

P.O.I  (x, y) is the same for both equations.

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20­22 POI equations.notebook November 19, 2013

CW p.21­22 (1, 2, 3, 8) 

P p.21­22 (all) 

8a) see graph

b) about 36 cones

Quiz Tomorrow

1,2,3

Page 12: 20-22 POI equations.notebook - ISD 622 · 2013. 11. 19. · Solve and check. 2 4 ... 13 Shen23Shen 47 67 811 Shen Shen Shen Shen 1516 16 1719 1819 Shen Shen 2022 2122 Shen Shen Shen

20­22 POI equations.notebook November 19, 2013

p.21­22 answers

1. (6, 350)            2. (2, 9)

3. (­2, ­8)             4. (­0.75, 7.5)

5. (0, 5)               6. (2, 10)Does studying matter?

a) see graph

b) positive correlation, as hours studying increase, test scores also increase.

a) see graph

b) about 36 cones

8.7.

Page 13: 20-22 POI equations.notebook - ISD 622 · 2013. 11. 19. · Solve and check. 2 4 ... 13 Shen23Shen 47 67 811 Shen Shen Shen Shen 1516 16 1719 1819 Shen Shen 2022 2122 Shen Shen Shen

20­22 POI equations.notebook November 19, 2013