Question

if the area of triangle ABC formed by joining the points A (x,y) , B(3,2) & C(-2,4) is square units then show that 2x+5y+4=0​

Answer 1

Answer:

given , x1=x y1 =y, x2=1,y2=2, x3=2, y3=1

area= 6 sq.units

area of triangle = 1/2 {x1(y2-y3)+x2(y3-y1)+x3(y1-y2)}

6=1/2{x(2-1)+1(1-y)+2(y-2)}

12=x+1-y+2y-4

12=x-3+y

12+3=x+y

15=x+y

hence proved

Step-by-step explanation:

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