exam Maths Puzzle Numerical Ability

how do you find the slope of the line passing through the given points
ex. (2,1),(6,9)

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exam Other Question

x squared times the cube root of (1/x^15 y^8) Is -22 a:
Natural Number
Real Number
Interger
Rational Number
Irrational Number
Real Number

My answer: real number,whole number and an interger