How would you solve 16+y=3

To solve for a variable in any equation you want to do the opposite of PEMDAS, which would be SADMEP (Subtraction, Addition, Division, Multiplication, Exponents, Parenthesis). To use SADMEP, you just run down it like a list.

16+y=3 <------ Can we subtract? Yes. Minus 16 from both sides to isolate y.
y= (-13)

I believe you subtract sixteen from both sides.
Y= -13

Y=3-16
Y= -13

*I really don't no, but I think this is correct! Goodluck.

16 + y = 3
16 - 16 + y = 3 - 16
y = -13

Get " y " by itself.
So you would subtract 16 from both sides.

16 + y = 3
-16 -16

y = -13

Subtract 16 from both sides and then you got Y=-13

16+y=3
16-3=y
13=y