Answer:
The correct abswer
(a) Â Â Â Â (1991, 48900)
     (2001, 40500)
  slope M = (40500 - 48900)/(2001 - 1991) = -8400/10 = -840
  y = Mx + b
  48900 = (-840)(1991) + b
  48900 + 840*1991  =b
1721340 = b
 y = -840 x + 1721340
(b) Â 1721340 - 840*2006 = 36300
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