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Now we can plug y = 3 in the equation (2), then we get

x + 3 = 5

x = 5 – 3 = 2

So the solution is x = 2, y = 3

Now we can plug y = 1 in the equation (2), then we get

x + 1 = 20

x = 20 – 1 = 19

So the solution is x = 19, y = 1