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Things to Remember about slope and graphing

Slope of Horizontal Line


Slope of Vertical Line


Equation of Vertical Line

x = a number (where it crosses x-axis)

Equation of Horizontal Line

y = a number (where it crosses y-axis)

Slope Intercept Form of Equation of Line

y = mx + b

Standard Form of Equation of Line

Ax + By = C

Point-Slope Form of Equation of LIne

y - y1 = m(x - x1)

Slope Formula

m = (y2 - y1) / (x2 - x1)

Letter that is slope


Letter that is y-intercept



Point where line crosses y-axis (put in zero for x): (0,b)


Point where line crosses x-axis (put in zero for y): (a,0)

Words in word problem that mean slope

Rate of Change

Direction of positive slope

Up to the right

Direction of negative slope

Down to the right

Slopes of parallel lines....

... are the same slope

Slopes of perpendicular lines...

... have opposite reciprocal slope (one is +, one is - AND they are reciprocals)

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