exam Maths Puzzle Numerical Ability

write the equation of the line passing through each of the given pairs of points. Write your results in slope intercept form where possible.
#20 is: (-1,3) and (4,-2)

#24 is: (2,-3) and (2,4)

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exam Other Question

question:

(100P-4000)/100P =0.3

solve for P
please show all working
thanks
Find all numbers for which each rational expression is undefined. If the rational expression is defined for all real numbers, so state.

{x^+ 3/x^-3x +2}
{5x/6x - 24}

Simplif