Print first line equation
if ( g > 0 && 1 - tan ( x ) * given_slope != 0 ) cout << " y ▁ = ▁ " << slope_1 << " x ▁ + " << g << endl ; if ( g <= 0 && 1 - tan ( x ) * given_slope != 0 ) cout << " y ▁ = ▁ " << slope_1 << " x ▁ " << g << endl ; f *= ( - slope_2 ) ; f += y1 ;