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Use back-substitution to solve the system of linear equations below.
Q22: Solve <span class="ql-formula" data-value="t ^
Q47: Find the difference <span class="ql-formula"
Q47: Determine if x=2 is a
Q68: Find the common difference of the
Q80: Write <span class="ql-formula" data-value="8 x
Q82: Find a formula for the n
Q107: Multiply and simplify. <span class="ql-formula"
Q117: Factor a negative real number out of
Q136: Factor the trinomial <span class="ql-formula"
Q140: Find two integers c such that