MathNerd(version2.0)

Always solve for the innermost parenthesis first. 

(2/(5-(1/3)))

2/(5-0.33)

2/4.67

0.43

Assuming you mean:

6.5x + 4y = 2935

x + y = 450

The easiest way to solve this would be to multiply the second equation by -4

6.5x + 4y = 2935

-4x -4y = -1800

Add both equations

2.5x = 1135

x = 454

Plug x back into either equation

454 + y = 450

y = -4

Unless the question states it's ok to have a negative value, the system has no solution

I could be wrong, but unless you have anyone else to trust...>.>

infinity

if inf meant infinity, the answer is infinity

$100

He took $100, then he gave it back so the store lost nothing. But then they had to give him $70 worth of stuff and $30

6x - 3y = 30

4x + y = 2

Multiply the second equation by 3

6x - 3y = 30

12x + 3y = 6

Add both equations

18x = 36

x = 2

Plug x back into either equation

4(2) + y = 2

y = -6

2 - 6 = -4

0 because you have no money and they're imaginary apples

Was that the entire question?