exam Maths Puzzle Numerical Ability

Solve each of the following systems by substitution.
McGraw Hill 6th edition, 8.3 # 28.
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4x-12y=5
-x+3y=-1

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exam Other Question

What is the ratio of five days to two weeks (in days)? The lenght of an altitude of a triangle is one-third the lenght of the side to which it is drawn. If the area of the triangle is 6 square centimeters, find the lenght of that attitude?