$\"\"$

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

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

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

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

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

Multiply equation (1) by 3.

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

Addition equations (4) and (2).

$\"\"$

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

$\"\"$

Multiply equation (1) by 4.

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

Subtract equations (3) and (6).

$\"\"$

$\"\"$ --------------> (7)

Addition equations (5) and (7).

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

Infinitely many solutions.