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 is the independent variable and y depends on it.
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.
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.
the line on a graph that is horizontal/ side to side
the line on a graph that is vertical/up and down
the letter in a equation