Constants are commonly featured as numbers in expressions and equations. If we take the example of 12x + 14, 14 is our constant, because that number will never change. However, the 12 is an example of a coefficient, because this multiplies by the variable of x. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.