PreAlgebra-After "Check YourSelf"

Front

What is the formula to calculate the slope of a line?

Back

Slope (m) = (y2 - y1) / (x2 - x1)

Front

What does a negative slope indicate about a line?

Back

A negative slope indicates that as x increases, y decreases.

Front

What is an undefined slope?

Back

An undefined slope occurs when a line is vertical, meaning it goes straight up and down.

Front

How do you find the y-intercept of a line from its equation?

Back

The y-intercept is the value of y when x = 0.

Front

What is the y-intercept of the line represented by the equation y = 2x - 3?

Back

The y-intercept is -3.

Front

If a line has a slope of 0, what does that mean?

Back

A slope of 0 means the line is horizontal.

Front

What is the slope of the line that passes through the points (2, 3) and (4, 7)?

Back

Slope = (7 - 3) / (4 - 2) = 2.

Front

What does it mean for a line to be parallel to another line?

Back

Two lines are parallel if they have the same slope.

Front

What is the slope of a line that is perpendicular to a line with a slope of 3?

Back

The slope of a perpendicular line is -1/3.

Front

How can you determine if a point lies on a line given its equation?

Back

Substitute the x-value of the point into the equation and see if the resulting y-value matches.