Illustrative Math Grade 8 Unit 2 Test Review

Front

What is a scale factor in dilation?

Back

A scale factor is a number that scales, or multiplies, the dimensions of a figure in a dilation. It determines how much larger or smaller the image will be compared to the original figure.

Front

What happens to a figure during a dilation?

Back

A dilation changes the size of a figure but does not change its shape.

Front

How do you find the slope of a line given two points?

Back

The slope (m) is calculated using the formula m = (y2 - y1) / (x2 - x1), where (x1, y1) and (x2, y2) are the coordinates of the two points.

Front

What mathematical operation is used with the scale factor in a dilation?

Back

Multiplication is used with the scale factor to determine the new dimensions of the figure.

Front

What is the slope of a line that rises 3 units for every 2 units it runs?

Back

The slope is 3/2.

Front

What does a negative slope indicate about a line?

Back

A negative slope indicates that the line is decreasing, meaning as x increases, y decreases.

Front

What is the effect of a scale factor greater than 1 in dilation?

Back

A scale factor greater than 1 enlarges the figure.

Front

What is the effect of a scale factor between 0 and 1 in dilation?

Back

A scale factor between 0 and 1 reduces the size of the figure.

Front

What is the relationship between the slopes of parallel lines?

Back

Parallel lines have the same slope.

Front

What is the relationship between the slopes of perpendicular lines?

Back

Perpendicular lines have slopes that are negative reciprocals of each other.