$\"\"$

\

Given equations are,

\

$\"\"$ ----------(1)

\

$\"\"$ ---------(2)

\

The first equation is already solved for y,

\

So, substitute $\"\"$ for y in the second equation.

\

$\"\"$ (Second equation)

\

$\"\"$ (Substitute $\"\"$ )

\

$\"\"$ (Add: $\"\"$ )

\

$\"\"$

\

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

\

$\"\"$ (Subtract 1 from each side)

\

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

\

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

\

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

\

$\"\"$ (Divide each side by 9)

\

$\"\"$ (Cancel common terms)

\

$\"\"$ (Divide: $\"\"$ ) $\"\"$

\

Substitute $\"\"$ for x in either equation to find y.

\

$\"\"$ (First equation)

\

$\"\"$ (Substitute $\"\"$ )

\

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

\

$\"\"$ (Add: $\"\"$ )

\

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

\

The solution is $\"\"$ .