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If y is directly proportional to x, then the graph of y as a function of x is a straight line passing through the origin with the slope of the line equal to the constant of proportionality: it corresponds to linear growth.

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Proportional linear relationships:Proportional linear relationships can be expressed in the form y = kx where k represents the constant rate of change or slope of the line. The graph of a proportional relationship is a straight line that passes through the origin.

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y = 5x + 3 is an example of the Slope Intercept Form and represents the equation of a line with a slope of 5 and and a y-intercept of 3. y = −2x + 6 represents the equation of a line with a slope of −2 and and a y-intercept of 6.

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If you know the linear relationship between  two products then you can find the best way to market them together.

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In the math test, there was a question regarding the linear  relationship on the graph and it confused me a lot.<br>

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I am paid an hourly wage without overtime benefits, so the amount of hours I  work and the amount of money I am paid has a linear  relationship.

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A relationship of direct proportionality that, when plotted on a graph, traces  a straight line. In linear relationships,  any given change in an independent  variable will always produce a  corresponding change in the dependent  variable. For example, a linear relationship between production  hours and output in a  factory means that a  10 percent  increase or decrease in hours will result in a  10 percent increase or decrease in the output.