Question

The area of the triangle formed by points a(x,y),b(1,2)andc(2,1)if 6 square unit then show that x+y=15?​

Answer 1

Answer:

proved

Step-by-step explanation:

area=1/2((x1-x2)(y1-y3)-(x1-x3)(y1-y2))

==>(x-1)(y-1)-(x-2)(y-2)=12

==>x+y-3=12

==>x+y=15