Flashcard Review 4.1, 4.2

Front

What is the point where the x- and y-axis intersect?

Back

The origin.

Front

What is the slope of a horizontal line?

Back

0.

Front

What is the slope of a line that decreases from left to right?

Back

Negative.

Front

What is the slope of a line that increases from left to right?

Back

Positive.

Front

What is the slope of the line that passes through the points (4, -3) and (8, -3)?

Back

0.

Front

What is the slope of the line represented by the equation y = 2x + 1?

Back

2.

Front

What is the slope of the line represented by the equation y = -rac{1}{2}x + 3?

Back

-rac{1}{2}.

Front

What is the slope of the line represented by the equation y = -2x + 4?

Back

-2.

Front

What is the formula to calculate the slope between two points (x1, y1) and (x2, y2)?

Back

Slope = \frac{y2 - y1}{x2 - x1}.

Front

What does an undefined slope indicate about a line?

Back

The line is vertical.