MS Algebra Ch. 7.6 Uniform Motion Problems. Mr. Deyo
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1 MS Algebra Ch. 7.6 Uniform Motion Problems Mr. Deyo
2 Title: Uniform Motion Date: Learning Target By the end of the period, I will apply the concept of uniform motion to solve for the desired variable in a word problem. I will demonstrate this by completing Four- Square Notes and by solving problems in a pair/group activity.
3 Home Work 1-2-3: 1) Class 4-Square Notes Put In Binder? 2) Section 7.6 Pg ) Section TxtBk. Prob.#13,17,21,22,25 Notes Copied on blank sheet Solved and Put in Binder? of paper in Binder? Table of Contents Date Description Date Due
4 Storm Check (Think, Write, Discuss, Report) Questions on which to ponder and answer: 1. How are the two images similar? 2. How are they different? 3. How can these two images be related to math?
5 Daily Warm-Up Exercises For use with pages xxx xxx Two trains left a station in opposite directions. One traveled 50 miles per hour and the other traveled 45 miles per hour. How far apart were they after 2 hours? Train Station
6 Daily Warm-Up Exercises For use with pages xxx xxx Two trains left a station in opposite directions. One traveled 50 miles per hour and the other traveled 45 miles per hour. How far apart were they after 2 hours? Train Station ANSWER 190 miles
7 Vocabulary 1) System of Linear Equations 2) Distance 3) Rate (Speed) 4) Time
8 Sketch DAY 2 1. Review word Friendly Definition Physical Representation 2. Draw a sketch Wordwork DAY 3 and/or DAY 4 1. Review the word Friendly Definition Physical Representation 2. Show how the word works Synonyms/antonym Word Problems Related words/phrases Example/non-example Word List Friendly Definition DAY 1 1. Use Visuals 2. Introduce the word Friendly Definition Physical Representation 3. Use Cognates 4. Write friendly definition 5. Physical Representation DAY 5 1. Review the word Friendly definition Physical Representation Sentence 3. Write a sentence at least 2 rich words (1 action) correct spelling correct punctuation correct subject/predicate agreement clear and clean writing
9 Problem A KAYAKING A kayaker travels upstream at a speed of 2 miles per hour and downstream at a speed of 5 miles per hour. The speed of the current remains constant throughout the trip. Find the speed of the kayak in still water and the speed of the current.
10 Problem A KAYAKING SOLUTION A kayaker travels upstream at a speed of 2 miles per hour and downstream at a speed of 5 miles per hour. The speed of the current remains constant throughout the trip. Find the speed of the kayak in still water and the speed of the current. x y = 2 x + y = 5 2x = 7 x = 3.5 x = speed of kayak y = speed of current y = 5 y = 1.5 ANSWER Kayak 3.5 mi/h, Current 1.5 mi/h
11 Problem B Write and solve a linear system (ANNOTATE) KAYAKING During a kayaking trip, a kayaker travels upstream (against the current) and downstream (with the current) at the speeds shown below. The speed of the current remains constant. Find the speed of the kayak in still water and the speed of the current.
12 Problem B Write and solve a linear system KAYAKING During a kayaking trip, a kayaker travels upstream (against the current) and downstream (with the current) at the speeds shown below. The speed of the current remains constant. Find the speed of the kayak in still water and the speed of the current.
13 Problem B Write and solve a linear system SOLUTION STEP 1 Write a system of equations. Let x be the speed of the kayak in still water, and let y be the speed of the current. STEP 2 Solve the system of equations. x y = 4 Write Equation 1. Equation 1: Going upstream x + y = 6 Write Equation 2. x - y = 4 Equation 2: Going downstream x + y = 6 2x = x = 10 5 Substitute 5 for x in Equation 2 and solve for y. 5 + y = y = 6 1 Add equations. Solve for x. Substitute 5 for x in Equation 2. Subtract 5 from each side. ANSWER x = 5 y = 1
14 Storm Check (Think, Write, Discuss, Report) When reading the problem, what is the first and probably most difficult step in solving a linear system of equations? The first and most difficult step in solving a system of linear equations is.
15 Notes: Distance = (Rate)(Time) D=RT Distance Rate or Speed Time 1 st Equation (East, 1 st Boat, etc.) 2 nd Equation (West, 2 nd Boat, etc.) Total
16 Problem A Write a system of equations AIRCRAFT A helicopter leaves an airport and flies north at 180 miles per hour. An hour later, an airplane leaves the airport flying in the same direction at 330 miles per hour. Write a system of equations that can be used to determine how long it will take the airplane to overtake the helicopter. D=RT Distance Rate or Speed Time Helicopter Airplane Total
17 Problem A Write a system of equations AIRCRAFT SOLUTION A helicopter leaves an airport and flies north at 180 miles per hour. An hour later, an airplane leaves the airport flying in the same direction at 330 miles per hour. Write a system of equations that can be used to determine how long it will take the airplane to overtake the helicopter. D=RT Distance Rate or Speed Time Helicopter D 180 x Airplane D 330 y = x - 1 Total 180x = 330y 180x =330y y = x x = 330y 180x = 330(x-1) 180x = 330x x =-330 x = 2.2 h y = = 1.2h
18 Problem A Write a system of equations AIRCRAFT SOLUTION STEP 2 Write a linear system. Let x be the helicopter s flying time, and let y be the airplane s flying time. y = x y = 180 x
19 Problem B WHAT IF? Suppose the airplane leaves a half hour after the helicopter. What would change in the system of equations used to determine how long it will take the airplane to overtake the helicopter. Original Equations y = x y = 180x
20 Problem B WHAT IF? Suppose the airplane leaves a half hour after the helicopter. What would change in the system of equations used to determine how long it will take the airplane to overtake the helicopter. Original Equations y = x - 1 ANSWER y = x y = 180x 330y = 180x
21 Guided Practice Two people are riding on a bicycle trail. The first person begins riding 1.2 hours before the second person. The first person is riding at 5 miles per hour. The second person is riding at 8 miles per hour. How long will it take for the second person to overtake the first person? 1.2 hours 2 hours 3.2 hours 16 hours
22 Guided Practice Two people are riding on a bicycle trail. The first person begins riding 1.2 hours before the second person. The first person is riding at 5 miles per hour. The second person is riding at 8 miles per hour. How long will it take for the second person to overtake the first person? 1.2 hours ANSWER B 2 hours 3.2 hours 16 hours
23 Home Work 1-2-3: 1) Class 4-Square Notes Put In Binder? 2) Section 7.6 Pg ) Section TxtBk. Prob.#13,17,21,22,25 Notes Copied on blank sheet Solved and Put in Binder? of paper in Binder? Table of Contents Date Description Date Due
24 Title: Uniform Motion Date: Learning Target By the end of the period, I will apply the concept of uniform motion to solve for the desired variable in a word problem. I will demonstrate this by completing Four- Square Notes and by solving problems in a pair/group activity.
25 Ticket Out Solve the linear system. 3x + 4y = 10 4x + 3y = 4 For use with pages xxx xxx A car was driven 312 miles at an average rate of 48 miles per hour. How long did the trip take?
26 Ticket Out Solve the linear system. 3x + 4y = 10 4x + 3y = 4 For use with pages xxx xxx A car was driven 312 miles at an average rate of 48 miles per hour. How long did the trip take? ANSWER (-2, 4) ANSWER 6.5 hours
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