Substitute Method:

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

Solve the equation 1 or 2 for x or y, since the x and y do not have a coefficient of $\"\"$ .

Solve the equation 2: $\"\"$ for y.

Divide each side by 6.

$\"\"$

Substitute the value of $\"\"$ in the equation 1: $\"\"$ and solve for x.

$\"\"$

The above statement is true, so the system has number of infinity solutions.

Let $\"\"$ , where a is any real number and $\"\"$ .

The solution set $\"\"$ .