Show that the line `x-y-6=0,4x-3y-20=0` and `6x+5y+8=0` are concurrent. Also, find their common point of intersection.

Explanation

To show that the lines \( x - y - 6 = 0 \), \( 4x - 3y - 20 = 0 \), and \( 6x + 5y + 8 = 0 \) are concurrent, we need to check the condition for concurrency. The lines are concurrent if the determinant formed by their coefficients is zero.

### Step 1: Write the equations in standard form
The given equations are:
1. \( x - y - 6 = 0 \)
2. \( 4x - 3y - 20 = 0 \)
3. \( 6x + 5y + 8 = 0 \)

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