To find the cost for one pencil using the equation \( y = 0.19x \), where \( x \) represents the number of pencils, we can substitute \( x = 1 \) into the equation:
\[ y = 0.19(1) \]
Calculating this gives:
\[ y = 0.19 \]
Thus, the cost for one pencil is $0.19.
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