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slope the steepness of a line slope intercept form y=mx+b point slope form ysub2-ysub1=m(xsub2-xsub1) standard form Ax+By=C slope formula m= change in y/change in x = (ysub2)-(ysub1) / (xsub2)-(xsub1) linear equation equation of a line x-intercept the x coordinate of the point where the line crosses the x-axis (the y coordinate is 0) y-intercept the y coordinate of the point where the line crosses the y-axis (the x coordinate is 0) negative reciprocal opposite reciprocals (ex: 4 and -1/4) translation the sliding of the graph of an absolute value equation parallel lines lines with the same slope and different y-intercepts perpendicular lines lines that intersect to for a right angle (their slopes are opposite reciprocals)