To find this out, use a percent proportion, use cross products, and solve the equation.

So, the percent tip is 14%.
This is fairly simple
multiply the number by 10 until there is no decimal
then put the number over that
13008/1000
Now simplify
1626/125
OR
13 1/125
It looks like the system is

Compute the eigenvalues of the coefficient matrix.

For
, the corresponding eigenvector is
such that

Notice that the first row is 1 + 2i times the second row, so

Let
; then
, so that

The eigenvector corresponding to
is the complex conjugate of
.
So, the characteristic solution to the homogeneous system is

The characteristic solution contains
and
, both of which are linearly independent to
and
. So for the nonhomogeneous part, we consider the ansatz particular solution

Differentiating this and substituting into the ODE system gives


Then the general solution to the system is

It would be B, although it could be different if there’s a picture above