To evaluate the expression \(-3y + 4\) when \(y = 4\), substitute \(4\) for \(y\):
\[ -3(4) + 4 \]
Calculating this step-by-step:
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Multiply \(-3\) by \(4\): \[ -12 \]
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Now add \(4\): \[ -12 + 4 = -8 \]
So, \(-3y + 4\) when \(y = 4\) equals \(-8\).