exam Maths Puzzle Numerical Ability

HOW WOULD I SIMPLIFY THIS EXPRESSION

1/y - 1/y-3

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exam Other Question

I have the following problem; Write the equation of the line which passes through the point (2,1) and is parallel to the equation y = 5/2x + 6. My answer is y= 5/2x - 1 is this correct? Please help. graph the solution set of x+2y<3.