An expression simply contains no equals sign. This is an expression:
2x + 4y + 3
An equation contains an equals sign. This is an equation:
2x + 4y + 3 = 0
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SIMILAR TERMS-algebraic terms which have the same literal factors and in which each letter has the same exponent in all of the terms.DISSIMILAR TERMS-algebraic terms which have only one or more of their literal factors are the same.Do you know that kemp jones garbo is the only boy who is hondsome in the world?
An analogy compares similar relationships. There is no requirement that the analog pairs be dissimilar. Both metaphor and simile can compare traits. Similes use the word "like" or "as."
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Homology- Evolved from a common ancestor Analogous- 2 similar structures that evolved differently