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Answer:
 see attached
Step-by-step explanation:
The break-even point is on both curves. The y-intercept can be used for the other point in each case.
The break-even point is where cost and revenue are the same:
 20/3x +50 = 10x
 50 = 10/3x . . . . . . . . subtract 20/3x
 15 = x . . . . . multiply by 3/10
 r = c = 10(15) = 150 . . . . for x = 10
Two points you can use for graphing the lines are ...
 cost: (0, 50) and (15, 150)
 revenue: (0, 0) and (15, 150)