That means that they are always true. For example:
x + x = 2x
is true for ANY value of "x", so it is an identity. In contrast,
x + 2 = 5
is only true for one specific value of "x", so it is not an identity.
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A system of linear equations.
an Identity equivalency
i2+i0=
the little numbers are called exponents. Do you mean this? 32. this is an exponent. (the little 2)
In simple terms all that it means that there are more solutions than you can count!If the equations are all linear, some possibilities are given below (some are equivalent statements):there are fewer equations than variablesthe matrix of coefficients is singularthe matrix of coefficients cannot be invertedone of the equations is a linear combination of the others