The graph of linear equation ax+by+c=0,a≠0,b≠0 cut x-axis at point ( (-c/a),0) .

• At x-axis , the y coordinate become zero (0) .
• According to the question ,

       given equation of line is ax+by+c=0

       at x-axis , y coordinate = 0

       putting the value of y into the equation of line,

       ax + b(0) + c =0

        x = (-c / a)