Linear Functions Review

The value of y varies directly with x.  Which function represents the relationship between x and y if y = 20/3 when x = 30?

• y = 200x

• y = 2/9x

• y = 110/3x

• y = 9/2x

Write the equation of the line from the graph.

• x = -5

• y = -5

• y = -5x

• y = x - 5

Match

• y > -4/5x - 1 and y ≤ 2/3x + 3

• y ≥ -4/5x - 1 and y ≤ 2/3x + 3

• y < -4/5x - 1 and y < 2/3x + 3

• y < -4/5x - 1 and y ≥ 2/3x + 3

A group of friends will buy at most 8 snacks at the movie theater and spend no more than $42.  They will pay $4 for each box of candy and $7 for each tub of popcorn.  The system of inequalites that represents the situation is:
x + y <= 8 
4x + 7y <= 42 
Which combination of candy and popcorn can the group buy? 

• 2 boxes of candy and 6 bags of popcorn 

• 3 boxes of candy and 4 bags of popcorn

• 5 boxes of candy and 4 bags of popcorn

• 8 boxes of candy and 1 bags of popcorn

Write the equation in point-slope form of the line that passes through the given point and has the given slope:
 (-2, -1); m= -3

• y + 1 = -3(x - 2)

• y + 1 = -3(x + 2)

• y - 1 = 3(x - 1)

• y + 2 = -3(x + 1)

Write the equation below in standard form
y = 2/3 x +5

• -2/3x+y=5

• -4x+6y=15

• 2x-3y=-15

• -2x+3y=15

Write the equation of the horizontal line that contains the point (-3, 5).

• x = -3

• y = 5x

• y = 5

• y = -3x + 5

Find the slope of the line y = -2.

• m = 0

• m = -2

• m = undefined

• m = 1

Find the slope of the line.

• -2

• 2

• -1

• 1

Find the slope of the line.

• -5/4

• 5/4

• -4/5

• 4/5