TOPICS
This page:
equations
Search
Dr. Math
See also the
Dr. Math FAQ:
order of operations
Internet Library:
equations
MIDDLE SCHOOL
About Math
Algebra
equations
factoring expressions
graphing equations
Arithmetic
division
exponents
factorials
factoring numbers
fractions/percents
logarithms
Definitions
Geometry
2dimensional
conic sections/
circles
triangles/polygons
3D and higher
polyhedra
History/Biography
Logic
Measurement
calendars/
dates/time
temperature
terms/units
Number Sense
factoring numbers
negative numbers
pi
prime numbers
square roots
Probability
Puzzles
Ratio/Proportion
Statistics
Word Problems

Browse Middle School Equations
Stars indicate particularly interesting answers or
good places to begin browsing.
Selected answers to common questions:
Solving simple linear equations.
 Switching Dollars and Cents [10/07/1997]

How do I find an equation?
 System Of Equations With Products Of Variables [10/29/2003]

I'm trying to solve a system of three equations and three variables
where the variables are multiplied together, such as 'xy' and 'yz'.
Substitution doesn't seem to be working very well  what's a good way
to get started?
 Three Simultaneous Equations [4/16/1996]

Can you help me solve this problem?
 To Multiply or Divide? That Is the Question. [09/02/2003]

In a story problem, how do you know whether to multiply or divide?
 Trains, Times, and Tunnel Vision: Thinking beyond Formulas [06/28/2010]

A student seeks a formula to solve a "two trains" word problem. Rather than indulge in formulaic thinking, Doctor Ian suggests using related rates to make the problem simpler.
 Transposing Equations [07/14/1998]

I am having trouble when transposing. When y = 2x + 3, how do you find
the value of x?
 Turning an Equation UpsideDown [07/09/2001]

After this step: 2/h = (a+b)/ab, a book shows this: h/2 = (ab)/(a+b). Can
you simply invert the fractions and maintain the equivalency?
 Two Planes and Not Enough Information [08/10/2004]

Two planes leave Chicago, one traveling due east and the other due
west. The first travels 100 miles per hour faster than the second.
How long will it be until they are 2000 miles apart?
 Two Step Equations [02/24/1998]

How to solve twostep equations.
 TwoStep Equations [01/30/2003]

What are two different twostep equations that have 1.2 as their
solution?
 Undefined Fractions [06/10/2005]

I am having trouble determining the difference between an undefined
fraction and a fraction with no solution. Maybe you can help me
determine the difference.
 Understanding Parabolas [02/04/1997]

Explain why the sign of the x^2 coefficient in the equation for a
parabola determines whether the parabola opens up or down?
 Variables, Explained [05/05/2003]

I have problems trying to understand how to answer and work out these
types of math problems: 13.7b  6.5 = 2.3b + 8.3.
 Variation on Combined Work [06/13/2002]

If you run a large pipe for 4 hours, and run a small pipe for 9 hours,
you can fill 1/2 a pool. If you run both pipes together for 12 hours,
you can fill the whole pool. How long would it take to fill the pool
using each pipe by itself?
 Writing Out Equations [12/18/1997]

How do you do equations like 6x+7 = 3x+16 ?
 x  8 = 5 [06/13/2001]

I know the answer but our teacher wants us to show all of our work and
add something to both sides.
 X and YIntercepts [09/15/1998]

I'm having a hard time finding out how to solve an equation and then do
the graph. The intercepts confuse me also...
Page: [<prev]
1
2
3
4
