Question 841247
You have the equation as   C=5x+10y
You are given with the points (200 , 500)
Which is similar as (x , y) co-ordinate .
So   x = 200  and  y = 500
Plug the values in the function we get , 
   C=5x+10y
    = 5(200) + 10(500)
    = 1000 + 5000
    = 6000

Thank you .