Solve the following system of linear equations graphically: `x-y=1`
`2x+y=8`

Explanation

To solve the system of linear equations graphically, we will follow these steps:

### Step 1: Rewrite the equations in slope-intercept form (y = mx + b)
The given equations are:
1. \( x - y = 1 \)
2. \( 2x + y = 8 \)

For the first equation:
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