How can you determine whether two systems of equations are equivalent? If the two systems can be multiplied by different constants to become the same system, the two systems are equivalent.

If the two systems can be combined into a single system, the two systems are equivalent.

If the two systems graph to perpendicular lines, the two systems are equivalent.

If each equation in the system contains an equal sign (=), then all equations in the system are equivalent.

The equivalency of equations in a system can only be determined by calculations of deviation from the mean.