UPSKILL MATH PLUS

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Answer variants:
−11
10
11
9
−10
The line passes through the points \((1, 1)\) and \((4, -8)\) is perpendicular to the line through the points \((3, 6)\) and \((15, y)\). Find the value of \(y\).
 
The value of '\(y\)' \(=\)
.