Simplify $7x + 5y - 3x - 8y$
$
\begin{equation}
\begin{aligned}
&= 7x - 3x + 5y - 8y && \text{Use the Commutative Property of Addition}\\
\\
&= (7-3)x + (5-8) y && \text{Use the Distributive Property } ba+ca= (b+c)a\\
\\
&= 4x - 3y && \text{Subtract coefficient}
\end{aligned}
\end{equation}
$
Wednesday, August 1, 2012
Beginning Algebra With Applications, Chapter 2, Test, Section Test, Problem 2
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