   f(x) = m * x + b
  How do i solve for f(45) = 15 = m * 45 + bf(135) = 5 = m * 135 + b What is the equation.... school has been too long!Thanks 
  5 = m*135 + b <=> b = 5-m*135Put into other equation:15 = m*45 + 5-m*135<=> 15= -90*m + 5<=> -10/90= m<=> m = -1/9   5 = m*135 + b <=> b = 5-m*135 = 20[edited by - L0rdy on August 1, 2003 6:13:43 PM] [edited by - L0rdy on August 1, 2003 6:16:58 PM];  -(1/9)*x + 20m = -(1/9)b = 20   [edited by - noVum on August 1, 2003 6:13:47 PM];  f(45) = 15 = m * 45 + bf(135) = 5 = m * 135 + b 135m-45m=-10  - because difference...you know90m=-10m=-1/9b=20 