Select the correct answer.
Which system of equations can be represented by this matrix?

C

Step-by-step explanation: As you most likely know, the matrix represents the system of equations. If you assume that x is the far left column, that y is the column adjacent to it, and that y is to the left of the line, you can assume that these are the equations represented:

1x-3y+2z=-9

1x+0y+1z=1

0x+2y-1z=7

which can be simplified to

x-3y+2x=-9

x+z=1

2y-z=7

First of all, let's derive all the quantities. We know that Jermaine has tokes. So, if you have 4 more tokens, it means that you can start from this quantity, and add 4. In formula Karen has

tokens.

By the same logic, 5 fewer than a certain quantity means to subtract 5 from that quantity, so Raul has

tokens.

Now we're ready to write the ratio between the two numbers: simply put Karen's tokens at the numerator and Raul's tokens at the denominator and substitute and with the expressions we just found:

Obviously, since we don't know the value of , we can't say exactly how many tokens anyone has, or computing the ratio numerically, but only express it in terms of .