exam Maths Puzzle Numerical Ability

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Solve graphically and algebraically.

2x-3y=6 x+2y=10

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-x Squared + 2x = 8 My son had this problem on a test, can you help?

Carla drove to the mountains, averaging 30 mph. Coming back by the same roads, she averaged 20 mph. The total driving time was 5 hours. How far did she travel one way?