| A | B |
|---|
| line of best fit | the most accurate trend line on a scatter plot |
| trend line | the line on a scatter plot that shows the relationship between two sets of data |
| correlation coefficient | a number that tells how closely the line of best fit models the data. |
| linear inequality | a mathematical sentence describing a region on the coordinate plane having a boundary line. |
| solution of an inequality (two variables) | any ordered pair that makes the inequality true |
| parallel lines | Two lines in the same plane that never intersect. These lines have the same slope. |
| perpendicular lines | Lines that intersect to form right angles. The product of their slopes is -1. |
| negative reciprocal | A number of the form -b/a, where a/b is a nonzero rational number. |
| absolute value equation | Equations whose graph forms a V that opens up or down |
| translation | Shifts a graph horizontally, vertically, or both |
| Standard form of a linear equation | The form of a linear equation Ax + By = C, where A, B, and C are real numbers and A and B are not both zero |
| x-intercept | the x-coordinate of the point where a line crosses the x-axis |
| point-slope form | A linear equation of a nonvertical line written as y - y1 = m (x - x1). The line passes through the point x1, y1) with the slope m. |
| ratio | A comparison of two numbers by division |
| rate | A ratio of a to b where a and b represent quantities measured in different units |
| unit analysis | The process of selecting conversion factors to produce the appropriate units |
| Proportion | An equation that states that two ratios are equal. |
| Extremes of a proportion | In the proportion, a/b =c/d , a and d are the extremes. |
| Means of a proportion | In the proportion, a/b=c/d , b and c are the means. |
| Cross products | In a proportion, a/b =c/d , the products of ad and bc. These products are equal. |
| Similar figures | Figures that have the same shape, but not necessarily the same size. |
| Scale drawing | An enlarged or reduced drawing similar to an actual object or place. |
| Scale | The ratio of a distance in a drawing to the actual distance. |
| Percent of change | The ratio of the amount of change to the original amount expressed as a percent. |
| Percent of increase | The percent of change found when the original amount increases. |
| Percent of decrease | The percent of change found when the original amount decreases. |
| Greatest possible error | One half of the measuring unit, for any measurement. |
| Percent error | The ratio of the greatest possible error to the measurement. |
| direct variation | a linear function that can be expressed in the form y=kx, where k does not equal 0 |
| constant of variation for direct variation | the nonzero constant k in the function y=kx |
| rate of change | the relationship between two quantities that are changing. The rate of change is also called slope. Rate of change equals the change in the dependent variable divided by the change in the independent variable |
| slope | the ratio of the vertical change to the horizontal change. |
| linear equation | an equation whose graph forms a straight line |
| y-intercept | the y-coordinate of the point where a line crosses the y-axis |
| slope-intercept form | a linear equation of a nonvertical line written as y=mx+b, where m is the slope and b is the y-intercept |
| ratio | A comparison of two numbers by division |
| rate | A ratio of a to b where a and b represent quantities measured in different units |
| unit analysis | The process of selecting conversion factors to produce the appropriate units |
| Proportion | An equation that states that two ratios are equal. |
| Extremes of a proportion | In the proportion, a/b = c/d , a and d are the extremes. |
| Means of a proportion | In the proportion, a/b=c/d , b and c are the means. |
| Cross products | In a proportion, a/b = c/d , the products of ad and bc. These products are equal. |
| Similar figures | Figures that have the same shape, but not necessarily the same size. |
| Scale drawing | An enlarged or reduced drawing similar to an actual object or place. |
| Scale | The ratio of a distance in a drawing to the actual distance. |
| Percent of change | The ratio of the amount of change to the original amount expressed as a percent. |
| Percent of increase | The percent of change found when the original amount increases. |
| Percent of decrease | The percent of change found when the original amount decreases. |
| Greatest possible error | One half of the measuring unit, for any measurement. |
| Percent error | The ratio of the greatest possible error to the measurement. |
