1 answer
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To go from the equation \( 2x + 7y = 14 \) to the equivalent equation \( 4x + 14y = 28 \), you should multiply the entire equation \( 2x + 7y = 14 \) by **2**.
So, \( 2 \cdot (2x + 7y) = 2 \cdot 14 \) gives you:
\[
4x + 14y = 28.
\]
The correct answer is **2**.