the 4 regions into which the coordinate plane is divided by the x-axis & y-axis.
(+,+) the quadrant in which both the x & y coordinates are positive.
(-,+) the quadrant in which the x-coordinate is negative & y-coordinate is positive.
(-,-) the quadrant in which both the x & y coordinates are negative.
(+,-) the quadrant in which the x-coordinate is positive & the y-coordinate is negative.
An equation whose graph is a line.
standard form of a linear equation; where A, B, & C are real numbers, and A & B are not both zero.
Ax+By=C, provided B≠0 (B is not equal to zero).
the x-coordinate of a point where a graph crosses the x-axis.
the y-coordinate of a point where a graph crosses the y-axis.
the ratio of the vertical change (rise) to the horizontal change (run); rise over run; (y2-y1) ÷ (x2-x1)
Rate of Change
A comparison of a change in one quantity with another quantity; slope.
Two lines in the same plane that do not intersect.
y=ax; given that a is a non-zero number; y is said to vary directly with x.
Constant of Variation
the non-zero constant 'a' in a direct variation equation 'y=ax'.
f(x)=mx+b; f(x)=y; read as "the value of f at x" or "f of x".
Family of Functions
a group of functions with similar characteristics.
Parent Linear Function
f(x)=x; the most basic function form; all functions are built off of this.