Which statement is true? 1. A system of equations consists of two or more linear equations that must be true at the same time.
2. A system of equations consists of two or more equations that must be true at the same time.
3. A system of equations consists of two or more equations with at least one linear equation such that all equations must be true at the same time.
4. A system of equations consists of exactly two equations that must be true at the same time.