(a) Let a,b, and c be integers such that a | b and a | c, and let x and y be arbitrary integers. Prove that a (bx+cy).

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Direct proof/proof by cases:
(a) Let a,b, and e be integers such that a | b and a | c, and let x and y be arbitrary integers.
Prove that a (bx + cy).
(b) An edge of a connected graph is called a bridge, if removing this edge makes the graph
disconnected. Show that every edge of a tree is a bridge.
(c) Show that |2x - 2|-|x+1| +2 ≥ 0 for every x € R.
Transcribed Image Text:Direct proof/proof by cases: (a) Let a,b, and e be integers such that a | b and a | c, and let x and y be arbitrary integers. Prove that a (bx + cy). (b) An edge of a connected graph is called a bridge, if removing this edge makes the graph disconnected. Show that every edge of a tree is a bridge. (c) Show that |2x - 2|-|x+1| +2 ≥ 0 for every x € R.
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