exam Maths Puzzle Numerical Ability

I need help solving this problem:

25.)The line joining (-1,0) and (3,3) is the base of a triangle whose altitude is 2. Find the locus of the 3rd vertex.
Ans. 3x-4y+13=0; 3x-4

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exam Other Question

A rectangular painting with a width of x centimeters has an area of x^2+50x square centimeters. Find a binomial that represents the length. The approximate distance above sea level,d, in kilometres, is given by the formula d= (400(log(P/2)-2.5))/30, where P is the barametric pressure in kilopascals(kPa). What is the barometric pressure 12 kilometres above sea level? PLEASE HELP ME :)