exam Maths Puzzle Numerical Ability

Show Algebraically that the ordered pairs (4,8)(1, 1,1 1/2) (2,3) are co linear

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exam Other Question

The diameter of a bushing is 1.65 in. The bushing has a tolerance of 0.007 in. Find the lower and upper limits of the diameter of the bushing. Is it possible to have 4 or 5 varables in algebra? if so how far can you go?