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Linear Equations Given as Formulas Help

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By — McGraw-Hill Professional
Updated on Sep 26, 2011

Introduction to Linear Equations Given as Formulas

At times math students are given a formula like I = Prt and asked to solve for one of the variables; that is, to isolate that particular variable on one side of the equation. In I = Prt , the equation is solved for “ I .” The method used above for solving for x works on these, too. Many people are confused by the presence of multiple variables. The trick is to think of the variable for which you are trying to solve as x and all of the other variables as fixed numbers. For instance, if you were asked to solve for r in I = Prt , think of how you would solve something of the same form with numbers, say

The steps for solving for r in I = Prt are identical.

All of the formulas used in the following examples and practice problems are formulas used in business, science, and mathematics.

Solve for q.

Solve for m .

Solve for C.

Solve for b .

Linear Equatinos Given as Formulas Practice Problems

Practice

Solve for indicated variable.

4. P = 2 L + 2 W ; L

5. L = L 0 [1 + a ( dt ); a

6. S = C + RC; C

7. A = P + PRT; R

9. L = a +( n – 1) d; n

Solutions

Practice problems for these concepts can be found at: Algebra Linear Equations Practice Test.

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