They are multiples of the same number.
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equivalent ratios
The ratio of 5 to 4 in lowest terms is simply 5:4. This ratio cannot be simplified further because 5 and 4 do not have any common factors other than 1. In mathematical terms, this means the ratio is already in its simplest form.
If they are both zero, the the fraction is undefined. Otherwise it means that the ratio is equal to one.
it means that there is no number that is equal to the euqation
It means a ratio from which all common factors have been removed: in much the same way as a fraction may be simplified.