Find the set of solutions for the given linear system. (If there are an infinite number of solutions use $s_1$ and $s_2$ as your parameters.) $-2x_1 + x_2 + 2x_3 = 1$ $-8x_3 + x_4 = -7$ $(x_1, x_2, x_3, x_4) = (frac{s_1}{2} + frac{s_2}{2} + frac{3}{2}, s_1, frac{s_2}{8} + frac{7}{8}, s_2)$
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