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

ab+ b^2
_______
4ab^5
________
a+b
______
6a^2b^4
2*__-5=17