Use these formulae to solve related questions Y = bo + bx Where Y = forecast or dependent variable; x = time variable; bo = intercept of the vertical axis; b, = slope of the trend line. The coefficients bo and b, are calculated as follows: (xy) - ; nx? - (2x) Ey-b, Ex bo = bi 11 where x = independent variable values; y = dependent variable values; n = number of observations. Find b1 5 points demand (Y) 250 230 time (X) 1 2 3 zigma X 6 (zigma x)^2 36 XY X^2 250 1 460 4 1566 9 zigma (Xy) zigma(X^2) 2276 14 in (number of observation) 3 522 Zigma Y 1002 Your