8th grade Math STAAR Practice Category 1 & 2

What value of x makes this equation true?

 

0.17x − 0.03 = 0.03x − 0.002

 

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Answer explanation

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Tags

CCSS.8.EE.C.7

A gas company charges a $16 monthly service fee and $0.6924 per hundred cubic feet of natural gas used during a month. Which equation best represents y, the gas company's monthly charges in dollars for using x hundred cubic feet of natural gas?

• y = 0.6924x − 16

• y = 16x + 0.6924

• y = 16x − 0.6924

• y = 0.6924x + 16

Tags

CCSS.8.EE.B.5

CCSS.8.F.A.1

CCSS.8.F.A.3

CCSS.8.F.B.4

A faucet leaks 0.8 gallon of water every 2 hours. Which graph has a slope that best represents the number of gallons per hour leaked by the faucet?

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CCSS.8.EE.B.5

CCSS.8.F.B.4

CCSS.8.SP.A.3

Which graph represents y as a function of x?

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Tags

CCSS.8.F.A.1

CCSS.8.F.B.5

After x hours of rainfall today, Yvette recorded the amount of rain in inches, y, in a gauge. The table shows the linear relationship for the recorded rainfall.

 

 

How many inches of rain was in the gauge before the rain began today, and what was the rate at which the rain fell in inches per hour?

• There was 0 inches in the rain gauge before the rain began, and the rain fell at a rate of 1.25 inches per hour.

• There was 2.5 inches in the rain gauge before the rain began, and the rain fell at a rate of 1.25 inches per hour.

• There was 3 inches in the rain gauge before the rain began, and the rain fell at a rate of 0.75 inch per hour.

• There was 1.5 inches in the rain gauge before the rain began, and the rain fell at a rate of 0.75 inches per hour.

Tags

CCSS.8.F.A.3

CCSS.8.F.B.4

CCSS.8.SP.A.3

Reorder the following four numbers are shown.

 

 

Which list shows the numbers in order from greatest to least?

• -3.2

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CCSS.8.NS.A.2

The two lines graphed on the coordinate grid represent a system of linear equations.

 

 

Which ordered pair best represents a solution to both equations?

• (4, −11)

• (0, 4)

• (9, −2)

• (6, 11)

Tags

CCSS.8.EE.C.8

Which equation does NOT show a proportional relationship between x and y?

• y = -15x

• y= 7x - 9

Tags

CCSS.8.EE.B.5

CCSS.8.F.A.2

CCSS.8.F.A.3

An online candy store sells 3 pounds of fudge for $54.99. Which function represents the relationship between x, the number of pounds of fudge ordered, and y, the total cost in dollars?

• y = 3(54.99)x

• y = (54.99 − 3)x

• y = 54.99x − 3

Tags

CCSS.8.EE.B.5

CCSS.8.F.A.3

CCSS.8.F.B.4

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

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CCSS.8.F.A.1

CCSS.8.F.A.3