Concept:Use the gradient-intercept form of a straight line: y=mx+c.Explanation:From the graph, the line passes through (0,4) and (3,0).The y-intercept is c=4.The gradient is computed as:m=x2−x1y2−y1=3−00−4=−34.Substitute m and c into the equation of a straight line:y=−34x+4.Multiply through by 3 to remove the fraction:3y=−4x+12.
