Homework Help: Math-Equations

Posted by Vp on Monday, September 3, 2007 at 1:01pm.

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 - drwls, Monday, September 3, 2007 at 1:25pm
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 - VP, Monday, September 3, 2007 at 1:34pm
  Could you break this down, step by step - and the teacher requires and equation for both
  
  Thanks
  - Math-Equations - Reiny, Monday, September 3, 2007 at 2:00pm
    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 - VP, Monday, September 3, 2007 at 2:12pm
  Thanks so much - I do understand the logic - is there an easier way to set up this equation fro a 5th grader
- Math-Equations - Kasey, Tuesday, December 9, 2008 at 1:07pm
  2x-3(x+4)= -5
Math-Equations - pertemuel, Tuesday, June 22, 2010 at 9:59pm
(1/3)y2+12=5x

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