8th STAAR 2.0 Review 1

Front

What is a proportional relationship?

Back

A proportional relationship is a relationship between two quantities where the ratio of one quantity to the other quantity is constant.

Front

Identify a situation that does not represent a proportional relationship: The total number of marbles in terms of the number of weeks, if Francisco has 36 marbles and purchases 5 additional marbles per week.

Back

This situation is not proportional because the total number of marbles does not increase at a constant rate; it starts with 36 marbles.

Front

What is a function in mathematics?

Back

A function is a relation where each input (x-value) has exactly one output (y-value).

Front

Which set of values is a function? (6,-5) (7, -3) (8, -1) (9, 1)

Back

This set is a function because each x-value is unique.

Front

What does it mean if a table has a repeated x-value?

Back

If a table has a repeated x-value, it means that the relation is not a function because one input corresponds to multiple outputs.

Front

If a force of 140 newtons stretches a spring 4 centimeters, how much will 350 newtons stretch it?

Back

10 centimeters.

Front

What is the formula for direct variation?

Back

The formula for direct variation is y = kx, where k is the constant of variation.

Front

What is the constant of variation in a direct variation problem?

Back

The constant of variation (k) is the ratio of y to x in the equation y = kx.

Front

How do you determine if a relationship is proportional from a graph?

Back

A relationship is proportional if the graph is a straight line that passes through the origin.

Front

What is the difference between a function and a non-function?

Back

A function has one output for each input, while a non-function has at least one input with multiple outputs.