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the solution to a system is where the two lines intersect upon a graph.
Parallel lines don't intersect, no matter how many of them there are.
In the same coordinate space, i.e. on the same set of axes: -- Graph the first equation. -- Graph the second equation. -- Graph the third equation. . . -- Rinse and repeat for each equation in the system. -- Visually examine the graphs to find the points (2-dimension graph) or lines (3-dimension graph) where all of the individual graphs intersect. Since those points or lines lie on the graph of each individual graph, they are the solution to the entire system of equations.
The graph of an equation is a visual representation of the values that satisfy the equation.
the graph for a quadratic equation ct5r