Linear Equation

An equation that can be expressed in the form:

Ax=B

Ax=B

Identity

an equation that is true for all values of the variables.

Linear Inequality

An inequality that can be expressed in the form

Ax≤B

Ax≤B

Linear Equation in Two Variables

Ax+By=C

Slope of the Line

m=Y2-Y1/X2-X1 or Rise/Run

Point-Slope Equation

y - y₁ = m(x - x₁)

Can be used to find the general equation.

Can be used to find the general equation.

Slope Y-intercept Equation

y=mx+b

m is the slope and b is the y-intercept

m is the slope and b is the y-intercept

Perpendicular "Test" Equation

m1 & m2 are perpendicular only if:

m1=1/m2

or

m1m2=-1

m1=1/m2

or

m1m2=-1