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y=mx+b

Y is the value on the vertical axis, the dependent variable.

X is the value on the horizontal axis, the independent variable.

m is the slope of the line. Slope is rise/run. The equation for slope is m=(y2-y1)/(x2-x1). It describes how many units up or down the graph travels for every unit traveled to the right. (If it's written as a fraction, like 2/5, that means two units up for every five units right).

b is the y-intercept. This is the y value when the x value is 0, when the line crosses the y-axis.

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Q: What does the mx in y equals mx plus b?
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