book Maths Puzzle Numerical Ability

please help me find the slope of the ff:

a. (9,8) (3,0)
b. (-4,-4) (4,-9)

thank you.

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book Other Question
1/x + x/2x+4 - 2/x^2 +2x what does "x" equal?

(x+1)(x-3)=4


What does "x" equal?

x(x-2)= -6