$\"\"$

The system of equations are $\"\"$ .

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

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

$\"\"$ -------------> (3)

Use elimination to make a system of two equations in two variables.

Addition equations (1) and (2).

$\"\"$

$\"\"$ --------------> (4) $\"\"$

Multiply equation (3) by 2.

$\"\"$ ------------------> (5)

Addition equations (5) and (2).

$\"\"$

$\"\"$ --------------> (6)

Subtract equations (4) from (6).

$\"\"$ $\"\"$

Infinitely many solutions.