Math MCAS Practice Gr. 8

Consider this system of equations. y = 2x x + 2y = 15 Which of the following shows the system of equations graphed on a coordinate plane?

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• -67

• -71

• -73

• -75

Select the three equations that are linear functions.

• y = -3x

• y = x

Quadrilateral QRST is shown on this coordinate plane.

Richard will rotate quadrilateral QRST 180° clockwise about the origin to form quadrilateral Q′R′S′T′.

Which of the following statements about the coordinates (x, y) of point Q’ is true?

• Both x and y will be positive

• Both x and y will be negative

• x will be negative
  y will be positive

• x will be positive

  y will be negative

Haley’s transformation of quadrilateral QRST will form quadrilateral Q′R′S′T′.

The coordinates (x, y) of point T′′ will both be negative.

Which of the following could be Haley’s transformation?

• Quadrilateral QRST will be reflected across the y-axis.

• Quadrilateral QRST will be reflected across the x-axis.

• Quadrilateral QRST will be rotated 90° clockwise about the origin.

• Quadrilateral QRST will be translated 3 units to the right and then 5 units down.

• A

• B

• C

• D

Functions H and K each show a relationship between x and y. Which of the following statements about functions H and K are true?

Select the three correct answers.

• The rate of change of function K is less than the rate of change of function H.

• The y-intercept of the line that represents function H is 1.

• The y-intercept of the line that represents function H is -2.

Based on the scatter plot, which ordered pair represents the outlier in the data?

• (5.5, 61)

• (7, 67)

• (8, 64)

• (8.5, 65)

Joshua saves $50 every 2 weeks he works. The total amount of money Joshua saves is proportional to the number of weeks he works. Which of the following graphs shows the amount of money, y, Joshua saves when he works for x weeks?

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A principal surveyed 75 seventh-grade and eighth-grade students. She asked them if they prefer to obtain news from the Internet or to obtain news from television. She created a table to display the data, as shown. Based on the table, select the three correct statements.

• 49 eighth-grade students participated in the survey.

• 50 seventh-grade students participated in the survey.

• 26 out of 49 students prefer to obtain news from the Internet.

• 3 out of 5 eighth-grade students prefer to obtain news from television.

• 8 out of 25 seventh-grade students prefer to obtain news from the Internet.