Across
- 2. There is no horizontal movement and hence the denominator is zero while calculating the slope. Thus, the slope of the line is undefined.
- 6. The vertical intercept of a graph is the point where the graph crosses the vertical axis. If the axis is labeled with the variable y, the vertical intercept is also called the y-intercept. Also, the term is sometimes used to mean just the y-coordinate of the point where the graph crosses the vertical axis. The vertical intercept of the graph of y = 3x - 5 is (0, -5), or just -5.
- 7. The slope of a line is the quotient of the vertical distance and the horizontal distance between any two points on the line.
- 8. how many units you move up or down from point to point. On the graph that would be a change in the y values. Run means how far left or right you move from point to point. On the graph, that would mean a change of x values.
- 9. two variables are negatively related; that is, when x increases, y decreases, and when x decreases, y increases.
Down
- 1. two variables are positively related—that is, when x increases, so does y, and when x decreases, y decreases also.
- 3. A linear relationship is a relationship between two quantities where one quantity has a constant rate of change with respect to the other. The relationship is called linear because its graph is a line. A linear relationship can be represented by an equation of the form y = mx + b, where m and b are constants.
- 4. In a linear relationship between two quantities x and y, with equation y = mx + b, the constant m is the rate of change. It tells you how much y changes when x changes by 1. It is also the slope of the graph of the relationship.
- 5. A mathematical term used to describe a line that has a constant rise or run