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Five-Minute Check (over Lesson 1–4)
CCSS
Then/Now
New Vocabulary
Key Concept: Addition / Subtraction Property of Inequality
Example 1: Solve an Inequality Using Addition or Subtraction
Key Concept: Multiplication / Division Property of Inequality
Example 2: Solve an Inequality Using Multiplication or Division
Example 3: Solve Multi-Step Inequalities
Example 4: Write and Solve an Inequality
Over Lesson 1–4
A. 5
B. 7
C. 11
D. 12
Evaluate the expression |4w + 3| if w = –2.
Over Lesson 1–4
A. 5
B. 7
C. 11
D. 12
Evaluate the expression |4w + 3| if w = –2.
Over Lesson 1–4
What is the solution to the equation2|3x – 1| – 1 = –5?
A.
B.
C.
D.
Over Lesson 1–4
What is the solution to the equation2|3x – 1| – 1 = –5?
A.
B.
C.
D.
Content Standards
A.CED.1 Create equations and inequalities in one variable and use them to solve problems.
A.CED.3 Represent constraints by equations or inequalities, and by systems of equations and/or inequalities, and interpret solutions as viable or nonviable options in a modeling context.
Mathematical Practices
4 Model with mathematics.
You solved equations involving absolute values.
• Solve one-step inequalities.
• Solve multi-step inequalities.
• set-builder notation
Solve an Inequality Using Addition or Subtraction
Solve 4y – 3 < 5y + 2. Graph the solution set on a number line.
4y – 3 < 5y + 2 Original inequality
4y – 3 – 4y < 5y + 2 – 4y Subtract 4y from each side.
–3 < y + 2 Simplify.
–3 – 2 < y + 2 – 2 Subtract 2 from each side.
–5 < y Simplify.
y > –5 Rewrite with y first.
Answer:
Solve an Inequality Using Addition or Subtraction
Answer: Any real number greater than –5 is a solution of this inequality.
A circle means that this point is not included in the solution set.
Solve an Inequality Using Addition or Subtraction
Which graph represents the solution to 6x – 2 < 5x + 7?
A.
B.
C.
D.
Which graph represents the solution to 6x – 2 < 5x + 7?
A.
B.
C.
D.
Solve an Inequality Using Multiplication or Division
Solve 12 –0.3p. Graph the solution set on a number line.
Original inequality
Divide each side by –0.3, reversing the inequality symbol.
Simplify.
Rewrite with p first.
Solve an Inequality Using Multiplication or Division
Answer:
Solve an Inequality Using Multiplication or Division
Answer: The solution set is p | p –40.
A dot means that this point is included in the solution set.
What is the solution to –3x 21?
A. {x | x –7}
B. {x | x –7}
C. {x | x 7}
D. {x | x 7}
What is the solution to –3x 21?
A. {x | x –7}
B. {x | x –7}
C. {x | x 7}
D. {x | x 7}
Solve Multi-Step Inequalities
Original inequality
Multiply each side by 2.
Add –x to each side.
Divide each side by –3, reversing the inequality symbol.
Solve Multi-Step Inequalities
Solve Multi-Step Inequalities
A.
B.
C.
D.
A.
B.
C.
D.
Write and Solve an Inequality
CONSUMER COSTS Javier has at most $15.00 to spend today. He buys a bag of pretzels and a bottle of juice for $1.59. If gasoline at this store costs $2.89 per gallon, how many gallons of gasoline, to the nearest tenth of a gallon, can Javier buy for his car?
Understand Let g = the number of gallons of gasoline that Javier buys. The total cost of the gasoline is 2.89g. The cost of the pretzels and juice plus the total cost of the gasoline must be less than or equal to $15.00.
Write and Solve an Inequality
Original inequality
Subtract 1.59 from each side.
Simplify.
The cost ofpretzels & juice plus
the costof gasoline
is less thanor equal to $15.00.
1.59 + 2.89g 15.00
Plan Write an inequality.
Solve
Write and Solve an Inequality
Divide each side by 2.89.
Simplify.
Answer:
Write and Solve an Inequality
Divide each side by 2.89.
Simplify.
Answer: Javier can buy up to 4.6 gallons of gasoline for his car.
Check Since is actually greater than 4.6,
Javier will have enough money if he gets no more than 4.6 gallons of gasoline.
A. up to 700 miles
B. up to 800 miles
C. more than 700 miles
D. more than 800 miles
RENTAL COSTS Jeb wants to rent a car for his vacation. Value Cars rents cars for $25 per day plus $0.25 per mile. How far can he drive for one day if he wants to spend no more that $200 on car rental?
A. up to 700 miles
B. up to 800 miles
C. more than 700 miles
D. more than 800 miles
RENTAL COSTS Jeb wants to rent a car for his vacation. Value Cars rents cars for $25 per day plus $0.25 per mile. How far can he drive for one day if he wants to spend no more that $200 on car rental?
