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linear equation
an equation between two variables that gives a straight line when plotted on a graph.
slope
the steepness of a line
slope-intercept form
an equation of the form y=mx+b, where m is the slope of the line and b is the y-intercept
y-intercept
the y-coordinate of a point where a graph crosses the y-axis
x-intercept
the x-coordinate of a point where a graph crosses the x-axis
parallel lines
lines in the same plane that do not intersect
reciprocal
one of a pair of numbers whose product is 1: the reciprocal of 2/3 is 3/2
opposite (negative) reciprocal
one of a pair of numbers whose product is -1: the reciprocal of -4/5 is 5/4