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Grade 8 Chapter 5

Linear Equations

constant of variation the constant k (in y = kx)
direct variation a linear relationship between two variables
family of functions a set of functions whose graphs have basic characteristics in common
linear equation any equation that can be written in standard form Ax + By = C
linear function a function whose graph forms a straight line
parallel lines lines in the same plane that do not intersect
parent function the simplest function with the defining characteristics of the family
perpendicular lines lines in the same plane that intersect at 90 degree angle
rate of change a ratio-compares the amount of change in a dependent variable to independent variable
reflection a transformation that reflects or “flips” a graph or figure across a line of reflection
rise the difference in the y-values of two points on a line
rotation a transformation that rotates or turns a figure about a point called the center of reflection
run the difference in the x-values of two points on a line
slope a measure of the steepness of a line-rise over run
transformation a change in the position
translation a transformation that slides every point of a figure or graph the same distance and direction
x-intercept the x-coordinate of the point where a graph intersects the x-axis
y-intercept the y-coordinate of the point where a graph intersects the y-axis
absolute value function a functions whose graph forms a v shape |x|
quadratic functions a functions whose graph forms a parabola x2
Created by: bookannelid