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linear equation

A linear equation in two variables describes a relationship in which the value of one of the variables depends on the value of the other variable.

x

x is the independent variable and y depends on it.

y

We call y the dependent variable.

Important to remember about lines

Not every point on the line that the equation describes will necessarily be a solution to the problem that the equation describes.

points

any two points determine a line

graphing a line

Find two pairs of values and draw a line through the points they describe. Must graph as a straight line.

x-axis

the line on a graph that is horizontal/ side to side

y-axis

the line on a graph that is vertical/up and down

variable

the letter in a equation

slope form

y=mx+b