Question 905421
x + y = 16

x = 3y - 4

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3y - 4 + y = 16

4y - 4 = 16

4y = 16 + 4

4y = 20

y = 20/4

y = 5.

We now know that y = 5.

Let us plug y = 5 into either original equation to find x.

I will use x + y = 16.

x + 5 = 16

x = 16 - 5

x = 11

The two numbers are 5 and 11.