exam Maths Puzzle Numerical Ability

i really need someones help with this problem

Find the slope of the line that passes through...
(-6,-5)and(4,1)
thanks a bunch

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exam Other Question

Graph the equations.

(1) y = x squared - 4x

(2) y = -x + 1
How do I write this serie using sigma notation?

1/2 + 2/3 + 3/4 + ... 99/100