8th STAAR 2.0 Review 1

Front

What is a function?

Back

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

Front

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

Back

If a relation has a repeated x-value, it is not a function because one input cannot correspond to multiple outputs.

Front

Identify a set of values that represents a function: (9,5) (10,5) (9,-5) (10,-5), (3,4) (4,-3) (7,4) (3, 8), (6,-5) (7, -3) (8, -1) (9, 1), (2, -2) (5, 9) (5, -7) (1, 4)

Back

(6,-5) (7, -3) (8, -1) (9, 1) is a function because there are no repeated x-values.

Front

What is a proportional relationship?

Back

A proportional relationship is one where two quantities maintain a constant ratio.

Front

Which situation does not represent a proportional relationship?

Back

The total number of marbles in terms of the number of weeks, if Francisco has 36 marbles and purchases 5 additional marbles per week.

Front

What is the formula for direct variation?

Back

y = kx, where k is the constant of variation.

Front

If a force of 140 newtons stretches a spring 4 centimeters, what is the constant of variation?

Back

k = 4 cm / 140 N = 0.02857 cm/N.

Front

How do you find the stretch of a spring with a different force?

Back

Use the formula: Stretch = (Force / k).

Front

If a force of 350 newtons is applied, how much will the spring stretch?

Back

10 centimeters.

Front

What is the relationship between force and stretch in a spring?

Back

The distance a spring stretches varies directly as the force applied.