This is hw can someone solve it using the method of subtraction using addition

1. x=-2, y=12

2. y=3.5, x= 1.75

3. NoSolutions  

Step-by-step explanation:

Here's my work, hope it helps!

So in order to do this equation, would would have to subtract from the first dayday 1: 10,000day 2: 200day 3: 220day 4: 340day 5: 40day 6 350day 7: 250next you would add these values together and then divide by 710,000 + 200 +220 + 340+ 40 + 350 + 250=11,40011,400 divided by 7=1628.57142857this should be your answer.if not, try taking out the 10,000. i was not sure if this number was needed, since this was the starting number.