Two equal sides of an isosceles triangle...

Two equal sides of an isosceles triangle are given by `7x-y+3=0` and `x+y=3`, and its third side passes through the point `(1,-10)`. Find the equation of the third side.

`3x-y -31 =0 or x+y+7=0`

`3x- y+7 =0 or x+3y -31 =0`

`3x+y+7 =0 or 3y-31 =0`

Neither `3x + y+ 7 nor x-3y -31=0`

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