Just because 2 things are related doesn't mean they will both be changed when one thing happens. For example steak and candy, just because they are both food doesn't mean they taste the same or interact with each other.
It will be easier to understand this using a venn diagram :
2 = 1.313 is the right answer
3 = 24 is the right answer
4 = 27 is the right answer
If you move the negative on the left side of the second equation over to the right side, then we can see that the equation is equivalent to

.
Remember that an equation

represents a line with slope

and y-intercept

. Since both equations given have a slope of -2, but have different y-intercepts, they are
parallel.
Answer: 0.11429 (Rounded to fifth decimal place)