exam Maths Puzzle Numerical Ability

Write the standard form of an equation of the line that passes through each pair of points:

(-5,7), (0,1/2)

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exam Other Question

a/a'=b/b'=c/c' we made a triangle ABC to determine the lenght of a lake, then @ the top of the big triangle we made a smaller triangle BDE according to said formula we know ABC=BDE 54-6/2+6=?