graphing method is when you graph two lines and then find the intersection which is the answer of the system of equations
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Substitution is a way to solve without graphing, and sometimes there are equations that are impossible or very difficult to graph that are easier to just substitute. Mostly though, it is a way to solve if you have no calculator or cannot use one (for a test or worksheet).
They are the same.
what year was the graphing calculator invented
Put it into slope intercept form and then proceed to use your favorite method of graphing. slope-intercept: y = -3x + 1
its useful in graphing! equations, inequalities, ect pretty much graphing!