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In a trendline based on five observations if the average of y is 100 and slope 10 what is the intercept?

This is from a business math and statistics course

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Andy C. | Math/Physics TutorMath/Physics Tutor
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we need the average of X or the 5 observations
 
B = y - Mx
 
   = 100 - (10)x
 
  = 100 - 10x