- the four regions into which the coordinate plane is divided by the x-axis and y-axis.
- quadrants
- an equation whose graph is a line
- linear equation
- the x-coordinate of a point where a graph crosses the x-axis
- x-intercept
- the y-coordinate of a point where a graph crosses the y-axis
- y-intercept
- the slope, m, is the ratio of rise/run
- slope
- a linear equation written in the form y = mx + b, where m is the slope and b is the y-intercept of the equation's graph
- slope-intercept form
- two lines in the same plane that do not intersect
- parallel lines
- two lines in the same plane that intersect to form a right angle
- perpendicular lines
- the function f(x) = x, which is the most basic function in the family of linear functions
- parent linear function
- a group of afunctions with similar characteristics
- family of functions
- a way to name a function using the symbol f(x) instead of y
- function notation

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