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Write the word or phrase that best completes each statement or answers the question.
Which method should be used to solve the system? Explain your answer, including a description of the first step.
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Q42: <span class="ql-formula" data-value="z = x + 7
Q88: <span class="ql-formula" data-value="\left| \begin{array} { r r
Q98: <span class="ql-formula" data-value="\sum _ { k =
Q107: <span class="ql-formula" data-value="\sum _ { k =
Q118: <span class="ql-formula" data-value="4 x+3 y=12"><span class="katex"><span class="katex-mathml"><math
Q151: <span class="ql-formula" data-value="\left\{ \begin{aligned}8 x + y
Q156: After being struck with a hammer, a
Q204: The volume <span class="ql-formula" data-value="V"><span
Q208: <span class="ql-formula" data-value="13 + 16 + 19
Q216: <span class="ql-formula" data-value="\sum _ { k =