The three straight lines ax+by=c,bx+cy=a and cx+ay=b are collinear, if
b+c=a
c+a=b
a+b+c=0
a+b=c
Condition for collinearity :
Three straight lines ax+by=c,bx+cy=a and cx+ay=b are co-linear.
Adding all three equations.
ax+bx+cx+by+cy+ay=a+b+c
⇒x(a+b+c)+y(a+b+c)=a+b+c…………….1
For co-linearity, 0·x+0·y=0
Comparing with equation 1,
Hence, option (C) is the correct option.
Name the property where a,bandc
a+b=b+a: