exam Maths Puzzle Numerical Ability

Can someone help me on this problem?

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

Thanks,
Sher

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exam Other Question
Please can you help me, I tried figuring it out but no luck.
4x^4= 13x^2-9 How would you solve and equation with two variables like FOR EXAMPLE: 2x+3y=6 but you need to solve for x