exam Maths Puzzle Numerical Ability

Find an equation in the form y=mx+b(where possible) for eacjh line.
Through (0,5), perpendicular to 8x+5y=3

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exam Other Question
how do you find the area of a triangle solve algebraically: log4(x+41)-log4(2x-5) = 2 that is log base 4 (x+41) - log base 4 (2x-5) = 2