Question 954240
{{{ y - 6 = 1 }}}
Add {{{ 6 }}} to both sides
{{{ y = 7 }}}
-----------------------
Imagine yourself sitting on this line
You're at ( ? , 7 ). You notice that 
where ever you move to on this line,
you're at ( ? , 7 ) . You must be moving
parallel to the x-axis in order for this to
be true. All lines parallel to the x-axis
have slope = 0
If the equation was {{{ y = 23729 }}}, 
the slope would still = 0