Chapter 4 - Section 4.2 - Solving Systems of Linear Equations in Three Variables - Exercise Set - Page 220: 8

Infinitely many solutions The answer is thus given by the plane: $$ 3x + y - 2z = 2$$

Upon closer examination, we see that all of these equations are actually the same equation. After all, if you multiplied the second and third equation by the correct constant, you would get the first equation. Thus, there are infinitely many solutions.