$\"\"$

The equations are

$\"\"$ Equation (1)

$\"\"$ Equation (2)

$\"\"$

Subtract equation (2) from (1).

$\"\"$

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

$\"\"$

Apply subtraction property of equality: if a = b, then $\"\"$ .

Subtract 1 from each side.

$\"\"$

The solution is $\"\"$ .