coordinate planes, intercepts, #'s, ordered pairs..etc.
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It represents the point of intersection on a graph.
Yes, the graph of a linear equation can be a line. There are special cases, sometimes trivial ones like y=y or x=x which are linear equations, but the graph is the entire xy plane. The point being, linear equations most often from a line, but there are cases where they do not.
You use algebra and solve the system(s) of equations using techniques such as elimination or substitution.
Graphs can be used in the following way to estimate the solution of a system of liner equations. After you graph however many equations you have, the point of intersection will be your solution. However, reading the exact solution on a graph may be tricky, so that's why other methods (substitution and elimination) are preferred.
a point on a graph where if the graph is transformed the point stays the same.