Question

the ortjo centre of the triangle formed by tje lines x+y+1=0,x-y-1=0, and 3x+4y+5=ois​

Answer 1

x+y=-1

x-y=1

2x=0

x=0

and y=-1

then

3×0+4×-1+5=0

0-5+5=0

0=0