Part A: The distance a spring stretches varies directly with the amount of force applied. Write an equation to represent the direct relationship using d for distance and f for force. Part B: Find the constant of variation if a force of 110 newtons stretches a spring 5 inches. Part C: If the same spring is stretched 3 inches, how many newtons of force were applied? Show your work to support your answer.

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Equations and inequalities describe the relationship between two mathematical expressions.

Linear Functions

A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.