Otherwise , print the equation of the normal
if ( slope != -1 && slope != -2 ) { x1 *= - slope ; x1 += y1 ; if ( x1 > 0 ) cout << " y ▁ = ▁ " << slope << " x ▁ + ▁ " << x1 ; else cout << " y ▁ = ▁ " << slope << " x ▁ " << x1 ; } }