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September 19, 2014

September 19, 2014

Posted by **Anonymous** on Tuesday, February 12, 2013 at 9:10am.

and AB= root 34 unit. The coordinates of point B and Care (4,2)and (-1,y) respectively.

If area of triangle ABC = 17 sq.units, then find value of y.

- maths-urgently needed -
**Reiny**, Tuesday, February 12, 2013 at 9:32amarea = (1/2)(BC)(AB)

17 = (1/2)(√(5^2 + (2-y)^2 ) (√34

34/√34 = √(25 + 4 - 4y + y^2)

square both sides

34 = 29 - 4y + y^2

y^2 - 4y - 5 = 0

(y-5)(y+1) = 0

y = 5 or y = -1

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