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

Explanation

To find four solutions for each of the given equations, we will substitute different values for \( x \) or \( y \) and solve for the other variable.

### (i) For the equation \( 2x + y = 7 \):

1. **Let \( x = 0 \)**:
\[ 2(0) + y = 7 \implies y = 7 \]
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