Equations and Graphs

Front

What is the equation of a horizontal line?

Back

y = b, where b is a constant.

Front

What is the equation of a vertical line?

Back

x = a, where a is a constant.

Front

What does a slope of 0 indicate about a line?

Back

The line is horizontal.

Front

What does an undefined slope indicate about a line?

Back

The line is vertical.

Front

What is the general form of a linear equation?

Back

y = mx + b, where m is the slope and b is the y-intercept.

Front

How do you determine if a line is vertical or horizontal from its equation?

Back

If the equation is of the form y = b, it is horizontal; if it is of the form x = a, it is vertical.

Front

What is the slope of the line represented by the equation y = 2x + 3?

Back

The slope is 2.

Front

What does it mean if a line has a positive slope?

Back

As x increases, y also increases.

Front

What does it mean if a line has a negative slope?

Back

As x increases, y decreases.

Front

What is the y-intercept in the equation y = 2x + 3?

Back

The y-intercept is 3.