exam Maths Puzzle Numerical Ability

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Write an equation in the slope intercept form if possible: For the line which is at (0,-3) and is perpendicular to:
x - 2y = 7

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exam Other Question
To find an equation of a line given the slope and one point on the line

m = 0; (-5, 3)
4 How do you subtract this rational expression: 7/x-5 - 2+x/x-5? whats the answer?