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

Hello,

I would like to thank you all for your time, this is the last question I am having problems with.
Given cos(theta)=-0.4567 find the value(s) of theta, correct to the nearest degree, for 0 Find the equation (in standard form) of the line through (1, �7) and (4, �1).