Question 1027922
If the equation is {{{ y = 3 }}}, that is a horizontal line
through the point ( 0,3 )
The value of x could be any number, without changing 
the equation.
If {{{ x = 3 }}}, {{{ y = 3 }}}
If {{{ x = -19 }}}, {{{ y = 3 }}}
-----------------------
In fact,  I could say:
{{{ x = 311.0000028 }}}, {{{ y = 3 }}}