Question

find the points (1,1),(2,3)and(-3,x) vertices

Answer 1

x1=1 x2=2 x3=-3
y1=1 y2=3 y3=x

=>1/2I<1(3-x) +2(x-1)-3(1-3)>I =0
=>3-x+2x-2+6=0
=>x+7=0
=>x= -7
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