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Linear Equations and Functions Words to Know Linear equation An equation whose graph is a straight line y=x-4 6 1 -10 -5 0 -4 -9 -14 5 10 Slope (M) A measure of the steepness of a straight line Tells how fast one variable changes compared with the other. Rise over run y1 y2 M x1 x2 A M B Rise The change between two points on a line in an up-and-down direction Rise y1 y2 A M Run x1 x2 B Run The change between two points on a line in a left-to-right direction Rise y1 y2 A M Run x1 x2 B X-intercept The x-value of an ordered pair at the point where a line crosses the x-axis The x-value when the y-value is 0 (x,0) C x int ercept A Y-intercept (b) The y-value of the ordered pair at the point where a line crosses the y-axis The y-value when the x-value is 0.(0,y) C y int ercept (b) B Slope-intercept form y mx b m is the slope. b is the y-intercept Standard form Ax By C Direct variation y kx K is a positive number. As one variable increases, the other increases.