Verity by substitution that the root of $8 - 7 y = 1$ is $y = 1$ .

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Solution

$8 - 7 y = 1, y = 1$

$L H S$ $= 8 - 7 (1) = 1$

$R H S$ $= 1$

$L H S = R H S$

$∴ y = 1$ is a root

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