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The x-intercept will be the point (x,0)

The y-intercept will be the point (0,y)

Since you have two points, you can calculate the slope (which is m):

m = (y - 0) / (0 - x)

b is the y-intercept:

b = y

so, f(x) = mx + b

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Q: Determining fx equals mx plus b Given the x and y intercepts?
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