9514 1404 393
Answer:
zero
Step-by-step explanation:
Dividing the second equation by -3, it becomes ...
x -3y = 7/3
Compared to the first equation, ...
x -3y = 5
we see that it is <em>inconsistent</em>. No values of the variables can satisfy both equations. There are no solutions.
20 * (31/100) = 21*0.31=6.51
20.00-6.51=13.49
Caleb paid $13.49
I think 28 is the answer to your problem
The answer is in the picture.