exam Maths Puzzle Numerical Ability

how can we find the slope of two perpendicular line

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exam Other Question

1) What is the domain of f(x)= the square root of 3x+2
I wrote the words "square root" becaus I there is no symbol for it on the computer.

2) What is the domain of f(x)= what is the equation of the line that contains the points with (-3,7)and(5,-1)?