text: # Math-Equations
  
  posted by .
  
  Help: I need an equation for the following problems:
  When x=25, y=?
  In the function table the values for x are:
  x = 3,5,7,9 and y = 8,14,20.26
  
  #2
  When x=8, y=?
  In the function table the values for x are:
  x = 0,2,4,6 and y = 8,18,28,38
  
  • Math-Equations - ,
  
  In the first case, each increase of 2 in x increases y by 6 (three times as much as the increase in x). To get from x=9 to x=25, x must increasae by 16, so y must increase by 48, from 26 to 74.
  
  #2 can be done the same way, and is even easier. Increase x by 2 and y must increase by 10. You don't need the equation.
  
  • Math-Equations - ,
  
  Could you break this down, step by step - and the teacher requires and equation for both
  
  Thanks
  
  • Math-Equations - ,
  
  from the first set of data, select two ordered pairs,
  e.g. (3,8) and (5,14)
  slope =(14-8)/(5-3)
  = 3
  
  so the equation is y = 3x + b
  but (3,8) lies on this so
  8=3(3)+b
  b=-1
  and the equation is
  y=3x-1
  so when x=25
  y=3(25)-1
  = 74
  
  do the second one the same way
  
  • Math-Equations - ,
  
  Thanks so much - I do understand the logic - is there an easier way to set up this equation fro a 5th grader
  
  • Math-Equations - ,
  
  2x-3(x+4)= -5
  
  • Math-Equations - ,
  
  (1/3)y2+12=5x
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