exam Maths Puzzle Numerical Ability

*-2x+9=x+1

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I am doing school from home. The name of my school is penn foster.

Reduce fraction 6x/12x to lowest terms.
My answer was 1/2 but was not right. How do you test if something is a function on a graph? ......I remember my teacher saying something about using a pencil and lying it down on the graph, or something like that...please help!!!-I have a final TOMMMORROW!!!