Question 1165918
here's your graph.
copier A is in red.
copier B is in blue.


the cost for copier A is 120 + .05 * x
the cost for copier B is 250 + .03 * x


on the graph, the total cost for each copier is equal to y.


the equation for copier A is y = 120 + .05 * x
the equation for copier B is y = 250 + .03 * x


at 5000 copies a month, the total cost for copier A is 370 per month and the total cost for copier B is 400 per month.
copier A is cheaper.


at 10,000 copies a month, the total cost for cop[ier A is 620 per month and the total cost for copier B is 550 per month.
copier B is cheaper.


the break even point is at 6500 copies per month.
at 6500 copies per month, total cost for copier and the total cost for copier B is 445 per month each.


all this can be seen on the graph.
the graph is shown below.


<img src = "http://theo.x10hosting.com/2020/092701.jpg" >