exam Maths Puzzle Numerical Ability

find the slope of any line perpendicular to the line through points (0,5) and
(-3,-4)

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exam Other Question

solve equation 3+5h-9=4(3h+4)-1 20x+50 over 15x-30

I have to simplify this. Here is what I did:

((20+50))/((15x-30)) = ((4x+10))/((3x-6)) = ((2(2x+5)))/((3(x-2)))

Please tell me if this is right. I hope so! This is for a test.