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Home Page To 3 Rs To algebra
Presentation by Howard C. McAllister. Copyright 1996

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Problem: Determine the value of
y = a + b if a is twice b and b = 13.

The problem asks us to evaluate

This equation first requests
information about a.
The information is provided
by the problem statement. It is
The equation just written requests
information about b. The value of b
is provided by the problem statement.
Written in equation form it is

The result of substitution is

The result of doing the arithmetic is

Equations
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COPY and PASTE can be used to effect substitution.
Copy the top equation and paste it in the subtitution box.
Then copy the right side of each indented equation, starting with the first one, and paste them on the appropriate symbol, in the substitution box.
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