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Algebra Difficulty 1.0 Junior Find the answer Canada

If $x + 1 = y - 8$ and $x = 2y$ , then the value of $x + y$ is

(A) $-18$ (B) $0$ (C) $-9$ (D) $-27$ (E) $-36$

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Source: CEMC, University of Waterloo, licensed CC-BY-NC-4.0. Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.