1. Mathematics Vocabulary – Grade 8 ©Partners for Learning, Inc. Slope-intercept form An equation of the form y = mx + b, where m is the slope and b is the y-intercept.

2. Mathematics Vocabulary – Grade 8 ©Partners for Learning, Inc. Linear equation An equation that makes a straight line when it is graphed.

3. Mathematics Vocabulary – Grade 8 ©Partners for Learning, Inc. Rise The vertical change between two point on the graph of a line.

4. Mathematics Vocabulary – Grade 8 ©Partners for Learning, Inc. Run The horizontal change between two points on the graph of a line.

5. Mathematics Vocabulary – Grade 8 ©Partners for Learning, Inc. Slope The ratio of change in the vertical axis (y-axis) to change in the horizontal axis (x-axis). 3 -4

6. Mathematics Vocabulary – Grade 8 ©Partners for Learning, Inc. X-intercept The value of x at the point where a line or graph intersects the x-axis. The value of y is zero (0) at this point.

7. Mathematics Vocabulary – Grade 8 ©Partners for Learning, Inc. Y-intercept The value of y at the point where a line or graph intersects the y-axis. The value of x is zero (0) at this point.

8. Mathematics Vocabulary – Grade 8 ©Partners for Learning, Inc. Linear function A function that can be graphically represented on the coordinate plane by a straight line.

9. Mathematics Vocabulary – Grade 8 ©Partners for Learning, Inc. Positive association A relationship in paired data in which the value of both variables tend to increase or decrease together. as the values for x increase, so do the values for f(x). (-1,-3) (2,3)

10. Mathematics Vocabulary – Grade 8 ©Partners for Learning, Inc. Negative association A relationship in paired data in which the value of one variable tends to increase when the other increases, and vice-versa. -23 (-2,3) (2,-1) as the values for x increase, the values for f(x) decrease.

11. Mathematics Vocabulary – Grade 8 ©Partners for Learning, Inc. Non-linear function A function whose graph does not form a straight line. -2-10 -3 -2 1 2 6 -2 -6 2 -10

12. Mathematics Vocabulary – Grade 8 ©Partners for Learning, Inc. Step function A special type of function whose graph is a series of line segments.