A linear equation is an equation in the format y=mx+b, with y being the y-value in a data set, x being the x-value in a data set, m being the constant rate of change(also known as slope, which can be found on a graph by using rise/run, and can be found on a table as the change in y/the change in x) and b is the y-intercept(the value of y when x is 0 aka the starting point). All linear equations appear as a straight line on a graph.
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I have recently been doing all these direct variation problems but not every linear relationship is a direct variation... But every direct variation is a linear relation!
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No, I don't think that would fit the definition of a linear function.
X + y = z
Are you talking about the equasion?