
Slope of line BC is mBC=−126=−21
Slope of line AD=mBC1=2
∴ Equation of line AD is y−7=2(x+1)
⇒y=2x+9...(1)
Slope of line AC is mAC=−612=−2
Slope of line BE=mAC1=21
∴ Equation of BE is y−1=21(x+7)
⇒y=2x+29...(2)
Comparing equations (1)&(2), we get
2x+9=2x+9
⇒4x+18=x+9
⇒3x=−9⇒x=−3
∴y=2x+9=3
Therefore, orthocentre has co-ordinates (−3,3).