> with(plots):

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Numerical solutions of linear equations

x + 3*y = 4 2*x - y = 1

x + y = 2 x + y = 4

x + 3*y = 4 -2*x - 6*y = -8

Graphical solutions of linear equations

x + 3*y = 4 2*x - y = 1

x + y = 2 x + y = 4

x + 3*y = 4 -2*x - 6*y = -8