Write four solutions for each of the following equations: (i) \( 2 x+y=7 \) (ii) \( \pi x+y=9 \)...

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Write four solutions for each of the following equations:
(i) \( 2 x+y=7 \)
(ii) \( \pi x+y=9 \)
(iii) \( x=4 y \)
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