Therefore, the algebraic form y-3x = -1, x≤0 of the linear function is fully determined (Figure a)

The line represented by the graph of figure (b) of the questionnaire intersects the negative vertical half-axis. a> 0 at a point with abscissa zero and ordinate β = -1 <0, negative number. All points of the half have a negative abscissa if x≤0 and negative ordinate, since β <0. Therefore, the algebraic form y-3x = -1, x≤0 of the linear function is fully determined (Figure b)