
Let the line passing through (−3,4) intersect the coordinate axes at A & B.
By mid-point formula, co-ordinates of P(2α+0,20+β).
Comparing with given co-ordinate values, we get
2α+0=−3⇒α=−6
and 2β+0=4⇒β=8
Hence, equation of line is −6x+8y=1
⇒4x−3y+24=0