
Algebra PreAlgebra and Basic Algebra Math Forum 
 LinkBack  Thread Tools  Display Modes 
March 27th, 2019, 10:15 AM  #1 
Banned Camp Joined: Mar 2019 From: Mumbai Posts: 66 Thanks: 3  Simultaneous equations variant https://en.m.wikipedia.org/wiki/System_of_equations Can we have decimal points for the variables in Simultaneous equations? Example: 3.2x + 2.3y=5.1 4.1x  3.2y=7.2 Calculate the value of x & y. Thanks & Regards, Prashant S Akerkar 
March 27th, 2019, 11:14 AM  #2 
Member Joined: Oct 2018 From: USA Posts: 90 Thanks: 61 Math Focus: Algebraic Geometry 
You can use the substitution method in this case. Solving for $y$ in equation 1: $\displaystyle 2.3y = 5.13.2x$ $\displaystyle y = \frac{5.13.2x}{2.3}$ Now, since we know what $y$ is we can put it into equation 2 and solve for x: $\displaystyle 4.1x  3.2 \left( \frac{5.13.2x}{2.3} \right) = 7.2$ Once $x$ is solved, but that value into the equation for $y$ in terms of $x$ to get $y$ Last edited by Greens; March 27th, 2019 at 11:16 AM. 
March 27th, 2019, 01:16 PM  #3 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,597 Thanks: 1038  
March 27th, 2019, 01:50 PM  #4 
Global Moderator Joined: Dec 2006 Posts: 20,968 Thanks: 2217  In theory, the constants used in the equations needn't be integers. If constants such as 3.2 are given, it's desirable that it's clarified whether they should be treated as exact values. The solutions may be quite sensitive to slight errors (such as rounding or truncation errors) in the values of the constants.


Tags 
decimal, equations, point, simultaneous, variant 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Simultaneous equations.  prashantakerkar  Algebra  10  May 31st, 2017 12:08 PM 
Simultaneous Equations  Help please  baldgeezer  Algebra  4  April 19th, 2017 08:45 AM 
Simultaneous Equations  unistu  Geometry  3  December 3rd, 2014 09:18 PM 
Simultaneous Equations  bilano99  Algebra  3  June 30th, 2012 05:48 AM 
Simultaneous Equations  prashantakerkar  Algebra  5  August 29th, 2011 04:16 AM 