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