exam Maths Puzzle Numerical Ability

What is the equation of a line that passes through the point (14,-9)and has a slope of Zero?

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exam Other Question

what value should K be to make the following expression a perfect sum of squares:

2K(x)^2 - 24xy + 9(y)^2
Please help me solve this.

Solve for y in terms of x:log2x+log2y=1

This is all i have so far: log2xy=1 and log2 rewrites as b^p=n

So, b=2 p=1 and n=xy
What do i do after this?