18 terms

lsowatskyTEACHER

quadrant

one of four sections into which the coordinate plane is divided

solution of an equation in two variables

An ordered pair that produces a true statement when the coordinates of the ordered pair are substituted for the variables in the equation

graph of an equation in two variables

the set of points in a coordinate plane that represent all solutions of the equation

linear equation

an equation whose graph is a straight line

standard form of a linear equation

Ax + By = C, where A,B, and C are real numbers, and A and B are not both zero.

linear function

A function whose graph is a straight line.

x-intercept

the x-coordinate of a point where a graph crosses the x-axis

y-intercept

the y-coordinate of a point where a graph crosses the y-axis

slope

The steepness of a line on a graph

rate of change

A ratio that compares the amount of change in a dependent variable to the amount of change in an independent variable.

slope-intercept form

y = mx + b

parallel

lines that never intersect; lines that have the same slope

direct variation

y = ax

constant of variation

the number a in equations of the form y = ax

function notation

an equation in the form of 'f(x)=' to show the output value of a function, f, for an input value x

family of functions

a set of functions whose graphs have basic characteristics in common

parent linear function

The function f(x)=x, which is the most basic function in the family of linear functions.

slope formula