9.1 · Part II
Supported Application · Guided Entry to Today's Problem
independent variable · dependent variable
- Independent Variable (x): The input / cause that is chosen or changes freely
- Dependent Variable (y): The output / effect that depends on the independent variable
- Sentence check: 'The (dependent) depends on the (independent)'
- independent variable (variable independiente) — The quantity that is subject to choice. It does not depend on the other quantity.
- dependent variable (variable dependiente) — The quantity that changes in response to the independent variable.
- depends on (depende de) — One quantity depends on another when changing the first causes the second to change.
- quantity (cantidad) — Something that can be counted or measured.
- relationship (relación) — How two quantities change together.
- Naming the variables backward — calling the responding quantity 'independent' because it is the one the question asks about.
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1 MULTIPLE CHOICE
Which sentence is written in the correct order?
- ACalories burned depends on minutes jogged.
- BMinutes jogged depends on Calories burned.
- CCalories burned depends on Calories burned.
- DNeither quantity depends on the other.
✏️ Workspace & Solution Steps -
2 MULTIPLE CHOICE
A tray that got 2 hours of sun grew to 4 cm. A tray that got 6 hours grew to 12 cm. As sunlight increases, plant height…
- Aincreases
- Bdecreases
- Cstays the same
- Dcannot be determined
✏️ Workspace & Solution Steps -
3 MULTIPLE CHOICE
You buy tickets at $45 each. Which quantity depends on the other?
- ATotal cost depends on number of tickets
- BNumber of tickets depends on total cost
- CThe price per ticket depends on the total cost
- DNothing depends on anything here
✏️ Workspace & Solution Steps
Writing Task: Justify why your mathematical solution is accurate and complete.
9.1 · Part II
On-Level Application · Standard Rigor
independent variable · dependent variable
- Independent Variable (x): The input / cause that is chosen or changes freely
- Dependent Variable (y): The output / effect that depends on the independent variable
- Sentence check: 'The (dependent) depends on the (independent)'
- independent variable (variable independiente) — The quantity that is subject to choice. It does not depend on the other quantity.
- dependent variable (variable dependiente) — The quantity that changes in response to the independent variable.
- depends on (depende de) — One quantity depends on another when changing the first causes the second to change.
- quantity (cantidad) — Something that can be counted or measured.
- relationship (relación) — How two quantities change together.
- Naming the variables backward — calling the responding quantity 'independent' because it is the one the question asks about.
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1 MULTIPLE CHOICE
A gym charges $24.95 per month. Which pair correctly names the variables?
- AIndependent: months; Dependent: total cost
- BIndependent: total cost; Dependent: months
- CIndependent: $24.95; Dependent: months
- DIndependent: months; Dependent: $24.95
✏️ Workspace & Solution Steps -
2 MULTIPLE CHOICE
Claire jogs 30 minutes and burns 123 Calories. At the same rate, how many Calories would a 90-minute jog burn?
- A369
- B246
- C410
- D300
✏️ Workspace & Solution Steps -
3 MULTIPLE CHOICE
Which of these pairs is NOT a dependent relationship?
- ANumber of pizzas sold and number of employees the shop has
- BNumber of pizzas sold and weekly cost of cheese
- CHours jogged and Calories burned
- DTickets bought and total cost
✏️ Workspace & Solution Steps
Writing Task: Justify why your mathematical solution is accurate and complete.
9.1 · Part II
Extension & Non-Routine Application
independent variable · dependent variable
- Independent Variable (x): The input / cause that is chosen or changes freely
- Dependent Variable (y): The output / effect that depends on the independent variable
- Sentence check: 'The (dependent) depends on the (independent)'
- independent variable (variable independiente) — The quantity that is subject to choice. It does not depend on the other quantity.
- dependent variable (variable dependiente) — The quantity that changes in response to the independent variable.
- depends on (depende de) — One quantity depends on another when changing the first causes the second to change.
- quantity (cantidad) — Something that can be counted or measured.
- relationship (relación) — How two quantities change together.
- Naming the variables backward — calling the responding quantity 'independent' because it is the one the question asks about.
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1 MULTIPLE CHOICE
Two quantities are related. Which statement is ALWAYS true?
- AThe independent variable is subject to choice
- BThe independent variable is always the larger number
- CThe dependent variable is always measured in dollars
- DThe independent variable is always listed first in a table
✏️ Workspace & Solution Steps
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2 MULTIPLE CHOICE
Devon adds a different number of scoops of plant food to each tray of seedlings. Two weeks later he counts the new leaves on every tray. Which pair correctly names the variables?
- AIndependent: new leaves counted; Dependent: scoops of plant food
- BIndependent: the number of trays; Dependent: scoops of plant food
- CIndependent: scoops of plant food; Dependent: new leaves counted
- DIndependent: new leaves counted; Dependent: the two weeks of growing time
✏️ Workspace & Solution Steps -
3 MULTIPLE CHOICE
Give an example where the SAME quantity can be independent in one problem and dependent in another.
- ATime: chosen when you pick how long to jog, but measured as a result when you run a set distance
- BTime is always independent
- CTime is always dependent
- DA quantity can never switch roles
✏️ Workspace & Solution Steps
Writing Task: Justify why your mathematical solution is accurate and complete.