Independent and Dependent Variables

On a graph, which axis shows the dependent variable?

• x-axis

• y-axis

• neither

• it changes

Nancy can type 50 words per minute. Look at the table below to write an equation that matches the data.

• m=50 + w

• w= 50m

• w= 50 + m

• m= 50 - w

Write the equation for the table.

• y = 2x + 3

• y = x + 4

• y = 3x + 2

• y = x + 5

Write the equation for the table.

• y = x + 4

• y = 5x

• y = 4x + 1

• y = x + 5

Susan earns $10.00 an hour babysitting. She babysits for 5 hours. Which equation describes the relationship between her rate of pay (x) and the number of hours she works (y)?

• x = 10 + y

• y= 10x

• y= x - 10

• x = 10y

Mark has 100.00 in savings. Every week, his Dad pays him $10.00 for mowing the lawn and Mark adds this amount to his savings. Which equation represents the relationship between his total savings (y) and the number of weeks he mows the grass (x)?

• y = 100+ 10x

• y = 100x - 10

• x = 200y +12

• y = 200x+10

The following graph shows the relationship between the number of seats, y, and the number of rows, x.

How do the independent and dependent variables relate to each other?

• As the independent variable y increases by 1, the dependent variable x increases by 3.

• As the independent variable x increases by 1, the dependent variable y increases by 3.

• As the independent variable y increases by 1, the dependent variable x decreases by 3.

• As the independent variable x increases by 1, the dependent variable y decreases by 3.

A ​ ​ ​ (a)   variable changes in response to another variable.

• dependent

• independent

An ​ ​ (a)   variable causes the ​ (b)   variable to change..

• independent

• dependent

What is the independent variable in the statement? The number of pages read, p, and the time spent reading, t

• Independent variable: p

• Independent variable: t