8th Grade STAAR Review #3 (8.5D 8.5E 8.5F 8.5G)

The cost for electricity varies directly with the amount of kilowatt-hours of electricity used. The cost for using 1,079 kilowatt-hours of electricity was $129.48. What was the cost for using 908 kilowatt-hours of electricity?

• $41.52

• $153.86

• $75.67

• $108.96

Which table shows a proportional relationship between x and y?

• Table A

• Table B

• Table C

• Table D

The graph shows a relationship between x and y.

Which statement is true?

• The graph shows a non-proportional relationship because the graph has a negative slope.

• The graph shows a non-proportional relationship because the graph does not contain the origin.

• The graph shows a proportional relationship because the x and y intercepts both contain 7.

• The graph shows a proportional relationship because the graph passes through 3 different quadrants.

The table shows y as a function of x.

Which ordered pairs can also belong to the function shown in the table?

Select TWO correct answers.

• (-4, 3)

• (-2, 3)

• (4, 3)

• (6, 8)

• (9, 8)

Which mapping represents y as a function of x?

• A

• B

• C

• D

Which graph does NOT represent y as a function of x ?

• Graph F

• Graph G

• Graph H

• Graph J

Which set of ordered pairs represents y as a function of x?

Which representation shows y as a function of x ?

• F

• G

• H

• J

Which set of ordered pairs represents y as a function of x?

The scatterplot shows the number of customers and the number of servings of iced tea sold at a food trailer each day over a 7-day period.

Based on the scatterplot, which of these is the best prediction for the number of servings of iced tea sold on a day where the food trailer has 80 customers?

• 53

• 62

• 40

• 30