exam Maths Puzzle Numerical Ability

By using Slopes form, show that (3, 1), (6, 3) and (2, 9) are the vertices of a right triangle.

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exam Other Question

The value of a new $3500 sailboat decreases 10% per year. Find its value after 1 year. solve using the substitution method.First, solve one eqution for one variable.

3b+2a=2,
-2b+a=8