exam Maths Puzzle Numerical Ability

What is the easiest way to solve matrices and determinates with variables in them? I have tried and tried to understand them, but i just seem to confuse myself even more! Help!

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exam Other Question

A hockey team played 81 games in a season. They won 1 fewer game than three times the number of ties and lost 8 fewer games than they won. How many games did they win? Lose? Tie? The town of sprinfield purchased a Chevrolet, Ford and Toyota for total of $ 66,000. The Ford was $ 2000 more than the Cheverlot and the Toyota was $ 2000 more than the Ford. What is the price of each car?

Kindly help me. Thank you.