Pythagoras

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media type="custom" key="6254645" width="20" height="20" Rosemary H. Jenna S.  Angel G.  Alisen A. **
 * Pythagoras Group Members:

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As you can see we use substitution in Pre-Algebra as well as Algebra I in the following example...
= Substitution = = Ex) Is 30 a solution to 170 + x = 200 ?= = 170 + x = 200 < Rewrite the Equation = = 170 + (30) = 200 < Substitute 30 for x = = 200 = 200 <- Solve. =

162 = (r)(3 ) <--- Substitute the given information
162/3 = 3r/3 54 = r Your average speed was 54 mi/hr <- Answer in a complete sentence. **
 * 162 = 3r <--- Solve.

=== Step 1: Add both **equatio**ns. (If necessary, multiply one equation by a number that will give you a coefficient of one of the variables the same value as the coefficient in the other equation. Remember to multiply the entire equation by this number.) ===

x=3
=== Step 4: Substitute the value into one of the original equations, and solve for the other variable. ===