What is linear equations?

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a linear equation is an algebraic equation in which each term has an exponent of one and the graphing of the equation results in a straight line.

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the right answer is the third one: turnpikes went short distances to connect markets. turnpikes, also known as toll roads, were very important for trade and transportation (of people, goods and products) in the 19th century, coinciding with the expansion towards the west. they contributed significantly to the economic development of the united states.