Math 8 Final Exam Review

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Which of the followin relations is a function?

• {(7, -2), (9, -1), (3, -2), (9, 5)}

• {(8,4), (6,3), (6,3), (0,0)}

• {(4, -1), (7,0), (6, 0), (4, 0)}

• {(10, 2), (5, 3), (8, 1), (3, 2)}

Solve the following system of equations:

-7x + 2y = 3

7x + y = 12

• (-2, 8)

• (-3, 9)

• (1, 5)

• (2, -2)

Solve for x:

9x-2(4x + 5) = 2x - (4 - x) - 12

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• 9

• 3

• 12

Which pair of equations corresponds to the two lines in the graph?

Salvatore is the coach for a Little League baseball team. He wants to take the team to watch a major league game. If the admission charge is $12. 50 per adult and $8 per child, which expression could help Salvatore determine how much it would cost to take one adult (himslef) and n members of his team?

• nx(12.5 + 8)

• 12.5 + 8n

• 12.5n + 8

The graph of the line passing through the points (6, 7) and (4, 2) has a slope of

The graph shows the distance traveled by a person walking at a rate of 4 miles per hour:

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Write 5x + y = 10 in slope -intercept ( y= mx + b) f orm:

• y = 5x + 10

• y = -5x + 10

What is the slope of the line shown below?

• -4

• -1/4

• 1/4

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