roman numeral problem

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1

I put the problem [here](http://imageurlhost.com/images/u9ta1zrhuzfw1ta162yd_Math-question.png)for ease of comprehension.

Why isn’t the answer A? The right answer is C. I cannot understand how TCB figured out that b = c.

2

Look at where they are on the graph. Both are on an axis (both = 0).

3

Thanks, that’s just a new perspective on this problem.

4

The graph axes are confirmed to cross at (0,0). Therefore, the value of b & c is zero.