exam Maths Puzzle Numerical Ability

y=x+2
2x+y=11

Could someone please help me?

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exam Other Question

Rick and Don compete in the Honolulu Marathon. Rick is at the front of the pack, while Don is far back in the pack and actually crossed the start line a half hour after Rick. Don an airplane tooke 2 hours to fly 600 km against a head wind. The return trip with the wind took 1 2/3 hours. Find the speed of the plane in still air.