Test Practice - 8th Math

Which statement about non-zero real numbers is true?

• The sum of two rational numbers is not always rational.

• The product of two irrational numbers is always rational

• The product of a rational and irrational number can be rational or irrational

• The sum of a rational and irrational number can be rational or irrational.

What operation should I do?

• addition

• subtraction

• multiplication

• division

Eva and Rafael are both tutors. The graph shows how much (y) in dollars Eva charges for her services. The equation y = 35x represents the amount ( y), in dollars, Rafael charges when he tutors for x hours . His equation will be graphed on the same coordinate grid as Eva’s graph . Based on this information, which statement is true?

• Eva charges $5 more per hour than Rafael, and she has a higher initial fee, so their graphs will never intersect

• Eva and Rafael each charge the same amount per hour, but Rafael also charges an initial fee, so their graphs are parallel

• Eva charges $5 more per hour than Rafael, and neither charges an initial fee, so the only place their graphs will intersect is at (0, 0)

• Eva and Rafael each charge the same amount per hour and do not charge an initial fee, so the only place their graphs will intersect is at (0, 0) .

JKL and RST are similar triangles. The slope of JL is m/2. The slope of  RT is q . Which equation describes the relationship between m and q?

• m = –2q

• m = q/2

• m=q

• m = 2q

Below is systems of equations:

x + 2 = 7

2x + 3y = 8

Which statement describes one method to find the solution of the system of linear equations?

• Determine the point at which 2x + 3y = 8 crosses the vertical line x = 5

• Determine the point at which 2x + 3y = 8 crosses the vertical line x = 6

• Determine the point at which 2x + 3y = 8 crosses the vertical line x = 7

• Determine the point at which 2x + 3y = 8 crosses the vertical line x = 9

The red triangle represents what type of rotation:

• 180° Clockwise
• 90° Clockwise
• 90° Counter Clockwise
• 270° Clockwise

Rotate the point (7,8) around the origin 90 degrees counterclockwise.
State the image of the point.

• (-7,-8)
• (8,-7)
• (-8,7)
• (8,7)

Easy Car Rental charges $8.50 an hour plus a rental fee of $25.50. Which equation represents the total charges for x hours?

• y = 8.5 + 25.5
• y = 25.5 + 8.5x
• y = 8.5 + 25.5x

A man is climbing down from 100 feet high descending 30 feet per minute.

• y = - 30x + 100

• y = 100 + 30x

• y = 100x + 30

• y = 100x - 30

Write an linear equation to model the following:
You want to buy desserts, ice-cream is $2.50 per scoop and puppychow is $4 per bag and you want to spend $20. 

• y=2.50x+4
• 2.50x+4y=20
• y=4x+2.5