Book Maths Puzzle Algebra

two numbers differ by 6. The sum of the squres of the numbers is 218. find the numbers

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I need help on solving linear equations with abslute value's in them the problem is 3[y+51]-15=6 []used to represent abslute value brackets. I dont need the answer I just need help Two trains, one 500 meters long and the other 1000 meters long, are traveling in opposite directions on parallel tracks. The first train is traveling at 100km/h and the other at 80km/h. How long will it take for the trains to pass each other from the moment the locomotives are at the same point?