What is the sum of all values of $y$ for which the expression $\frac{y+6}{y^2-5y+4}$ is undefined?
Question:
What is the sum of all values of $y$ for which the expression $\frac{y+6}{y^2-5y+4}$ is undefined?
Answer:
Let's think step by step.

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What is the sum of all values of $y$ for which the expression $\frac{y+6}{y^2-5y+4}$ is undefined?
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