Write the Expression
A student has $10 saved and earns $4 each week.
4x + 10
In 5x + 12, what is the variable? Explain Why?
x
Expression: 4x + 10
Answers may vary. You start with $10 and earn $4 each week.
A student wrote 10x + 5 for:
"You start with $10 and earn $5 each week."
Correct expression is 5x + 10
Which grows faster? How do you know?
A. 2x + 40
B. 8x + 5
8x + 5
A plant starts at 12 cm and grows 3 cm each week.
3x + 12
In 5x + 12, what is the coefficient? Explain Why.
5
Expression: 3x + 15
Answers may vary. A plant starts at 15 cm and grows 3 cm each week.
A student says the constant in 6x + 25 is 6.
The constant is 25
Which has the bigger starting amount? How do you know?
A. 6x + 12
B. 4x + 30
4x + 30
A student has 20 stickers and gets 6 more each week.
6x + 20
In 5x + 12, what is the constant?
12
Expression: 8x + 20
Answers may vary. You start with 20 coins and earn 8 coins per level.
A student says the coefficient in 4x + 12 is 12.
The coefficient is 4
Why are 5x + 20 and 20 + 5x the same?
They contain the same terms; order doesn't change the value.
A school club has $50 already and earns $5 per ticket sold.
5x + 50
In 7x + 20, what does 20 represent?
The constant. It lets us know the starting amount.
Expression: 5x + 12
Answers may vary. You start with 12 stickers and get 5 more each week.
A student wrote 30x + 2 for:
"You start with 30 candies and get 2 more each day."
Correct expression is 2x + 30
Which expression matches this situation? Explain how you know.
"You have $15 and earn $3 each week."
A. 3x + 15
B. 15x + 3
3x + 15
A jar already has 30 candies and 2 candies are added each day.
2x + 30
In 9x + 15, what does 9 represent?
9 represents the coefficient. It represents the amount being multiplied by an unknown amount.
Expression: 10x + 5
Answers may vary. You have already biked 5 km, and you bike 10 km each hour.
A student wrote 7x + 15 for:
"You start with 7 stickers and get 15 each week."
Correct expression is 15x + 7
Expression: 9x + 12
What do the 9 and 12 represent?
9 = amount being multiplied by an unknown number each time
12 = starting amount