MCAP Review #3

Front

What is the y-intercept in the equation y = -3x + 7?

Back

The y-intercept is 7.

Front

Does the point (3, 8) lie on the line y = 3x?

Back

No, it does not.

Front

What defines a function?

Back

A function is a relation where each input has exactly one output.

Front

What is the equation for Juanita's monthly cell phone bill if she uses x minutes of airtime?

Back

C = 0.20x + 15.

Front

Which set of ordered pairs represents a function?

Back

A function must have unique outputs for each input.

Front

What is the slope of the line in the equation y = -3x + 7?

Back

The slope is -3.

Front

How do you find the slope from two points (x1, y1) and (x2, y2)?

Back

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

Front

What does it mean for a relation to be not a function?

Back

A relation is not a function if at least one input has multiple outputs.

Front

What is the formula for calculating the total cost (C) based on usage (x) and a fixed fee?

Back

C = fixed fee + variable cost per unit * x.

Front

What is the significance of the y-intercept in a linear equation?

Back

The y-intercept is the point where the line crosses the y-axis.