exam Maths Puzzle Numerical Ability

SOLVE THE SYSTEM BY GRAPHING
X+Y=4
-X+Y=2

ANY AND ALL ASSISTANCE WOULD BE SO GRATEFUL..PLEASE

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Science and Medicine. A plane flies 720 mi against a steady 30 mi/h headwind and then returns to the same point with the wind. If the entire trip takes 10 h, what is the planes spe Write in words 0.082