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A line passing through the points `(a ,\ 2a)` and `(-2,\ 3)` is perpendicular to the line `4x+3y+5=0` , find the value of `adot`

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Let m1​ be the slope of the line joining` A(a,2a)` and `B(−2,3)`.
Then, `m_1​=(2a−3​. )/(a+2)`
Let m2​ be the slope of the line `4x+3y+5=0`. Then, `m_2​=−(4​)/(3)`
Since given lines are perpendicular. Therefore,
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