exam Maths Puzzle Numerical Ability

Find the slope of the line through the points.
25). (1, 5) and (1, -3)

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exam Other Question

Y=2/3x and Y=-2/7x+4/7

I am not even sure how to set this up. Do I need to have the y-intercept for the first system of equation befor I can solve? Can you please help me set this problem up? Thanks for your help! Simplify 1/x-1/x^2 divided by x (hard to type it!)