scale & slope

Front

What is a scale factor?

Back

A scale factor is a number that scales, or multiplies, some quantity. In a scale drawing, it represents the ratio of a length in the drawing to the corresponding length in the actual object.

Front

In a scale drawing, if 1 inch represents 10 feet, what is the scale factor?

Back

10

Front

How do you determine the slope of a line?

Back

The slope of a line is determined by the ratio of the vertical change (rise) to the horizontal change (run) between two points on the line.

Front

What is the slope of a line that rises as it moves from left to right?

Back

Positive

Front

What is the slope of a line that falls as it moves from left to right?

Back

Negative

Front

What is the slope of a horizontal line?

Back

Zero

Front

What is the slope of a vertical line?

Back

Undefined

Front

If a line has a slope of 2, what does this mean?

Back

For every 2 units the line rises, it moves 1 unit to the right.

Front

In a scale drawing, if 3 cm represents 12 ft, what is the scale factor?

Back

4

Front

What is the relationship between scale factor and area?

Back

If the scale factor is k, the area of the scaled shape is k^2 times the area of the original shape.