Straight lines y=4-3x,at=x+10,2y+bx+9=0 represent the three consecutive sides of rectangle,then ab=?

Straight lines y=4-3x,at=x+10,2y+bx+9=0 represent the three consecutive sides of rectangle,then ab=?

Straight lines y=4-3x,at=x+10,2y+bx+9=0 represent the three consecutive sides of rectangle,then ab=?

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