Unit 4 Practice

Front

What is the value of f(0) if f(x) is defined as y = -\frac{2}{5}x - 3?

Back

4

Front

What is the equation of a line with a slope of -\frac{2}{5} and a y-intercept of -3?

Back

y = -\frac{2}{5}x - 3

Front

What is the equation of a horizontal line?

Back

y = c, where c is a constant.

Front

How do you find the value of a function at a specific point, such as f(-2)?

Back

Substitute -2 into the function's equation.

Front

If Sandy is walking home from the beach, how can we represent her distance from home as a function of time?

Back

y = -4x + 20, where y is the distance from home and x is the time in hours.

Front

What does the slope of a line represent in a real-world context?

Back

The slope represents the rate of change of one variable with respect to another.

Front

What is the y-intercept of the equation y = -\frac{2}{5}x - 3?

Back

The y-intercept is -3.

Front

How can you determine the slope of a line from its equation?

Back

The slope is the coefficient of x in the equation of the line.

Front

What does it mean for a function to be linear?

Back

A linear function has a constant rate of change and can be represented by a straight line on a graph.

Front

How do you interpret the function y = -4x + 20 in the context of Sandy's walk?

Back

For every hour Sandy walks, she decreases her distance from home by 4 miles.