Solve the System by the Substitution or Elimination Method $$\left( \begin{array} { r l } x ^ { 2 } + y ^ { 2 } & = 17 \\x + 4 y & = 17\end{array} \right)$$

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Q209: Solve the system. <span class="ql-formula"

Q210: Solve the problem by using a system

Q211: Solve each system of equations by

Q212: Solve the homogeneous system. <span

Q214: Solve the system. <span class="ql-formula"

Q215: Solve the system by the substitution

Q216: Evaluate <span class="ql-formula" data-value="2 \times

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Q218: If <span class="ql-formula" data-value="D =