3x-6y=9
-3x -3x
-6y=9-3x
__ ____
-6 -6
y=9-3x
____
-6
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y+9=14 subtract 9 from each side to get y by itself y=5
36 divided by 9 equals 4
y = -5x + 9 is the equation of a straight line. It cannot be parallel or perpendicular by itself, you need another line to compare it to.
There is no "equals" sign therefore "x-9" is NOT an equation.
This is called an equation....