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 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    2-dimensional      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. 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 Upside-Down [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 two-step equations. Two-Step Equations [01/30/2003] What are two different two-step 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 Y-Intercepts [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: [

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