Consider the Following System $$\left\{ \begin{array} { c } 7 x + y = 54 \\y = - 7 x - 18\end{array} \right.$$

question 26

Multiple Choice

Consider the following system: $$\left\{ \begin{array} { c } 7 x + y = 54 \\y = - 7 x - 18\end{array} \right.$$ Substitute $- 7 x - 18$ for y in the first equation. How many variables does the resulting equation contain?

• A)1
• B)0
• C)2
• D)4
• E)none of the above

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