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**with(plots):**

Warning, the name changecoords has been redefined

**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**