Yes.
Only if it's a function.
No, that is a equation.
x = -3y = -14
x=6=x=5+x=13+x=20 x cannot = x+5. This question has no answer.
x = 15
Put in function form. X = 5 + Y 5 + Y = - X Y = - X - 5 ==================The ordered pairs.
Yep. No values of X will ever repeat themselves.
x = 5
If its x+4x+5 then: 5x+5
x+4x+5=5x+5
x + 6
15