The value of (x-y) is 16
Further explanation:
We have to use the given values to find the value
Given

We will use:

Simplifying by using: 
So,

As we know that x+y=4
Putting the value in equation

Dividing both sides by 4

The value of (x-y) is 16
Keywords: Algebraic formulas, Simplification
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These cannot be set equal to each other. you know this because of the following: x + 2 = 10 + x. subtract x from both sides to get 2 = 10, which is not true. they cannot be set equal to each other.
7.25 hour is better because multiply by eleven and its 79.75 which is higher than the on on the table