exam Maths Puzzle Numerical Ability

Which line is the flattest (or is less steep)? Why?
y = 5x -6
y = 5x + 6
y = x - 3
y = 1/2x + 3

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exam Other Question

-2root-64 divided by root -16

its equals 4 or -4? how do you do 5 with a 2 up to the right - 3 with a 2 up to the right + 4 with a 2 up to the right = ?