Quarter 3 Exam Review

Solve p=4Tk for k

• k=p-4t

• k=(4p)/T

• k=p/(4T)

• k=(4T)/p

The total cost of ice cream varies directly with the number of pints that are purchased. Jill paid $12.84 for 6 pints of ice cream.

What is the direct variation equation that represents this situation if y represents Jill's total cost and x represents the number of pints she purchased?

• y=0.47x

• y=2.14x

• y=2.14x+12.84

• y=-2.14x

• x=1

• x=-1

• x=4

• no solutions

• infinitely many solutions

A drone is 400 feet above the ground begins descending at the rate of 20 feet per second. 

Which equation represents the relationship between t, the number of seconds of descent, and h, the height above the ground?

• h=20t+400

• h=20t-400

• h=-20t-400

• h=-20t+400

A student solved the given equation and justified every step except one. What is the missing reason?

• associative property of addition

• commutative property of addition

• multiplicative property of equality

• distributive property of multiplication over additon

• A

• B

• C

• D

A: -3x-4y=10

B: 2x-y=11

To solve the system of equations by elimination, what could be done to cancel out the y variable?

• Multiply A by -1 and B by -4

• Multiply A by 2 and B by 3

• Multiply A by 1 and B by -4

• Multiply A by -4 and B by 1

Which is true about the linear equation graphed to the left?

• The slope is positive 3/2 and the y-intercept is (0,-4)

• The slope is positive 2/3 and the y-intercept is (0,-4)

• The slope is negative 2/3 and the y-intercept is (0,-4)

• the slope is negative 3/2 and the y-intercept is (0,4)