The Math Forum

Ask Dr. Math - Questions and Answers from our Archives
Associated Topics || Dr. Math Home || Search Dr. Math

Substituting Values for Variables

Date: 9/2/96 at 19:18:54
From: Darlene Ayers
Subject: Substituting values for variables

This is what I know about this problem. a=-3/4 and b=-1/3.  Here is 
the problem:  2a+7b-ab/7a squared. Can you please work this problem?

Thanks so much.

Kristin Ayers

Date: 9/2/96 at 23:25:15
From: Doctor Jodi
Subject: Re: Substituting values for variables

Hi Kristin!  When you know the values for variables, you can replace 
the variables with their values.  For example, if you know

   z = 6

and you want to know

   2z + 1,

you can say

   2z + 1 = 2 X 6 + 1

since z = 6.

Then you know that 2z + 1 = 13.

Does that make sense?

Let us know if you need more help.

-Doctor Jodi,  The Math Forum
 Check out our web site!   
Associated Topics:
Middle School Algebra

Search the Dr. Math Library:

Find items containing (put spaces between keywords):
Click only once for faster results:

[ Choose "whole words" when searching for a word like age.]

all keywords, in any order at least one, that exact phrase
parts of words whole words

Submit your own question to Dr. Math

[Privacy Policy] [Terms of Use]

Math Forum Home || Math Library || Quick Reference || Math Forum Search

Ask Dr. MathTM
© 1994- The Math Forum at NCTM. All rights reserved.