Solve the system.
0.2x + 0.5y = 4
-0.1x + 0.3y = -2

The system solution is (20, 0)

Step-by-step explanation:

Let's begin by eliminating x.  Multiply the second equation by 2, obtaining

-0.2x + 0.6y = -4, and add this result to the first equation:

0.2x + 0.5y = 4

-0.2x + 0.6y = -4

             1.1y = 0, so y must be 0.

Substituting 0 for y in the first equation, we get:

0.2x + 0 = 4.  Dividing both sides by 0.2, we get x = 20.

The system solution is (20, 0).

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