$\"\"$

The equations are

$\"\"$ (Equation (1)

$\"\"$ (Equation (2)

Subtract the equations to eliminate variable v.

$\"\"$ (Subtract the corresponding colu $\"\"$

Substitute $\"\"$ in equation (1).

$\"\"$

$\"\"$ (Subtract 4 from each side)

$\"\"$ (Apply Commutative property: $\"\"$ )

$\"\"$ (Apply Additive inverse property: $\"\"$ )

$\"\"$ (Apply Additive identity property: $\"\"$ )

$\"\"$ (Subtract: $\"\"$ )

The solution is $\"\"$ $\"\"$

The solution is $\"\"$ .