The cover lines represent the chapter’s opening equations x + y = 7 and x − y = 1. Solving them simultaneously by addition gives 2x = 8, so x = 4 and y = 3, intersecting at (4, 3). Class ...
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The cover lines represent the chapter’s opening equations x + y = 7 and x − y = 1. Solving them simultaneously by addition gives 2x = 8, so x = 4 and y = 3, intersecting at (4, 3). Class ...