The equation is given in the slope intercept form; which means the "3" in front of the x means the cost for parking is 3 and x will be the amount of hours; just like the slope m in the equation y = mx + b
area=l*w=2*width*width=2*width^2 area+160=(2*width+1)*(width+1) A+160=2w^2+2w+w+1 A+160=2w^2+3w+1 putting value of a 2w^2+160=2w^2+3w+1 160=3w+1 w=53m l=106m