CCSS.Math.Content.8.F.B.4

A weightlifter is adding plates of equal weight to a bar.  The table below shows the total weight, including the bar, that he will lift depending on the total number of plates on the bar.
Number of Plates                   Total Weight (lb)
2                                               115
4                                               185
6                                               255
8                                               325
Based on this information, which statement is true?

• The bar weighs 35 lb without any plates.
• The bar weighs 70 lb without any plates.
• The bar weighs 45 lb without any plates.
• The bar weighs 25 lb without any plates.

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CCSS.Math.Content.8.F.B.4

What is the slope of the line with the equation y = 4x - 7?

• 4
• -7
• -3
• x

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CCSS.Math.Content.8.F.B.4

What is the equation in Point-Slope form that goes through the point (2,3) and has a slope of 5?

• y - 3 = 5(x - 2)
• y - 2 = 5(x - 3)
• y + 3 = 5(x + 2)
• y + 2 = 5(x + 3)

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CCSS.Math.Content.8.F.B.4

What does the x represent in this situation?
Manny’s Music Rental charges a fee of $40 plus $25 per month to rent a saxophone. Sid’s Saxophones charges $25 plus $30 per month to rent the same saxophone.
y = 25x + 40
y = 30x + 25

• price of a saxophone
• rental fee
• total cost
• number of months

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CCSS.Math.Content.8.F.B.4

A restaurant sells pizza for the prices in the data table.  Calculate the linear regression equation of the data.

• y = 1.5x + 12
• y = 12x + 1.5
• y = 0.67x - 8
• y = -8x + 0.67

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CCSS.Math.Content.8.F.B.4

Dan is wrapping gifts to earn money for camp. He calculates the amount of wrapping paper he needs based on the number of gifts.

r = the number of rolls of wrapping paper

g = the number of gifts

• g is the independent variable and r is the dependent variable

• r is the independent variable and g is the dependent variable

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CCSS.Math.Content.8.F.B.4

Write the slope-intercept form of the equation with the given point and slope.
Through (2,5)  and m= 1/2

• y=1/2x+4
• y=-1/2x-4
• y=4x-1/2

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CCSS.Math.Content.8.F.B.4

What best describes the data on this graph?

• This graph is linear and not proportional.

• This graph is proportional.

• This graph is non-linear.

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CCSS.Math.Content.8.F.B.4

Connor has sold 15 cups of lemonade at his stand and will sell 5 more cups per hour. Write an equation to represent this situation.

• y = 10x + 5

• y = 20x

• y = 15x + 5

• y = 5x + 15

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CCSS.Math.Content.8.F.B.4

The equation y=36 + 18x models the relationship between the height y, in inches, of a typical golden delicious apple tree and the number of years, x, after it was planted. If the equation is graphed in the xy-plane, what is indicated by the y-intercept of the graph?

• The age, in years, of a typical apple tree when it is planted

• The height, in inches, of a typical apple tree when it is planted

• The number of years it takes a typical apple tree to grow

• The number of inches a typical apple tree grows each year

Tags

CCSS.Math.Content.8.F.B.4