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Algebra Difficulty 1.0 Junior Prove it Canada

The line $y = ax + c$ is parallel to the line $y = 2x$ and passes through the point $(1, 5)$ . What is the value of $c$ ?

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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.