My Math Forum simple maths problem driving me nuts.

 Algebra Pre-Algebra and Basic Algebra Math Forum

 September 4th, 2018, 07:49 PM #1 Newbie   Joined: Sep 2018 From: toronto Posts: 2 Thanks: 0 simple maths problem driving me nuts. if 100x = 1.1 and 0x=0.9 what is the value of x? I need the answer to be written out into a formula as I'm trying to code an algorithm into a sliding function that increases a number by 10% when it's at 100, and decreases it by 10% when at 0. Last edited by skipjack; September 4th, 2018 at 08:42 PM.
 September 4th, 2018, 08:48 PM #2 Senior Member     Joined: Sep 2015 From: USA Posts: 2,100 Thanks: 1093 $0x = 0$ for all $x$ $10\% \text{ of }0 \text{ is }0$ maybe rethink exactly what it is you are trying to do.
 September 4th, 2018, 08:58 PM #3 Global Moderator   Joined: Dec 2006 Posts: 19,541 Thanks: 1750 Would an increase of (0.2x - 10)% be okay? That's -10% for x = 0 and 10% for x = 100. It would change the number y to (0.002x + 0.9)y, which is 0.9y for x = 0 and 1.1y for x = 100.
 September 5th, 2018, 06:41 AM #4 Newbie   Joined: Sep 2018 From: toronto Posts: 2 Thanks: 0 thank you so much skipjack! could you point me towards where I can learn more about these kind of problems. I imagine you did: y= the difference between the two points y= 1.1-0.9 y= 0.2 x= a number between 0 and 100 so (yx-10)%, but how did you get the -10?
 September 5th, 2018, 09:08 AM #5 Global Moderator   Joined: Dec 2006 Posts: 19,541 Thanks: 1750 I didn't say (yx-10)%. The change is (0.2x - 10)% for any y. Putting x = 0 gives -10%, and putting x = 100 gives 10%, as requested.

 Tags driving, maths, nuts, problem, simple

 Thread Tools Display Modes Linear Mode

 Similar Threads Thread Thread Starter Forum Replies Last Post mavi1 New Users 1 September 16th, 2017 09:36 AM wvu1811 Algebra 3 October 20th, 2013 07:26 AM pupbrown Algebra 5 May 4th, 2011 01:59 PM sophieT66 Number Theory 4 October 7th, 2010 09:19 AM pupbrown Number Theory 5 December 31st, 1969 04:00 PM

 Contact - Home - Forums - Cryptocurrency Forum - Top