Pretest-Unit 2. Dilations

Kayla thinks that the slope of a vertical line is undefined, while Joshua argues that the slope of a vertical line is zero. Who is correct?

• Kayla

• Joshua

• None of them

Find the rate of change shown in the table.

• -5

• -6

• -7

Find the slope of the graph.

• ½

• 1

• 3/2

Which of the following triangles could lie on the line graphed in question #3?

• A

• B

• C

• D

A line has a slope of zero. Which of the following points could this line pass through?

• (12, 9) and (12, 6)

• (3, -6) and (7, -6)

• (1, 4) and (2, 5)

• (-9, 7) and (9, -7)

Which of the following is true about the graph of the equation y = -5x + 10?

• The graph would increase from left to right.

• The graph would pass through the origin.

• The graph would have a positive y-intercept.

• The graph would have a slope of 10.

Write an equation in slope-intercept form to represent the linear relationship on the graph.

• y=-3x+10

• y=-4x+10

• y=-5x+10

Which of the following could be the graph of the equation y = -2x?

• Graph A

• Graph B

• Graph C

• Graph D

Which is a true statement about dilations?

• A dilation sometimes changes the orientation of the vertices.

• A dilation always preserves congruence.

• A dilation sometimes enlarges a figure.

• A dilation always changes the orientation of a figure.

Which of the following algebraic rules represents a dilation that is an enlargement?

• (1/3x, 1/3y)

• (0.1x, 0.1y)

• (5/6x, 5/6y)

• (5/2x, 5/2y)