The image shows a part of a graph. Below are four equations:

**
I
**
:
$y=\frac{2015}{e^x}$

**
II
**
:
$y=2015{e}^x$

**
III
**
:
$y={2015}^x$

**
IV
**
:
$y=e^{2015x}$

Which equation(s), when plotted, will produce the graph above?

*
This problem is part of the set
2015 Countdown Problems
.
*

II & IV
I, III & IV
II & III
III & IV

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By letting the value of x=0, the value of y must be equal to 1, and only III and IV satisfy these condition..