Not always. For example, X is equal to or less than 6 is not the same as X is equivalent to 6.
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Equivalent equations are equations that have the same solution set.
Equivalent Equations
If one (or more) of the equations can be expressed as a linear combination of the others. This is equivalent to the statements the matrix of coefficients does not have an inverse (or is singular), or the determinant of the matrix of coefficients is zero.
One way would be to solve the two equations. If they have exactly the same solution set, they are equivalent. Otherwise they are not.
Equations that have the same solution.