<P> If all the coefficients are zero, then either b ≠ 0 and the equation does not have any solution, or b = 0 and every set of values for the unknowns is a solution . </P> <P> If at least one coefficient is nonzero, a permutation of the subscripts allows one to suppose a ≠ 0, and rewrite the equation </P> <Dl> <Dd> x 1 = b a 1 − a 2 a 1 x 2 − ⋯ − a n a 1 x n . (\ displaystyle x_ (1) = (\ frac (b) (a_ (1))) - (\ frac (a_ (2)) (a_ (1))) x_ (2) - \ cdots - (\ frac (a_ (n)) (a_ (1))) x_ (n).) </Dd> </Dl> <Dd> x 1 = b a 1 − a 2 a 1 x 2 − ⋯ − a n a 1 x n . (\ displaystyle x_ (1) = (\ frac (b) (a_ (1))) - (\ frac (a_ (2)) (a_ (1))) x_ (2) - \ cdots - (\ frac (a_ (n)) (a_ (1))) x_ (n).) </Dd>

What is the equation for any straight line