\left\{ \begin{array} { c } { x + 3 y - 4 z + t = - 4 } \\ { 5 z - t = 117 } \\ { 2 y + 7 z + 3 t = 19 } \\ { 3 z + 4 t = 1 } \end{array} \right.
Solve for x, y, z, t
x = \frac{4842}{23} = 210\frac{12}{23} \approx 210.52173913
y = -\frac{904}{23} = -39\frac{7}{23} \approx -39.304347826
z = \frac{469}{23} = 20\frac{9}{23} \approx 20.391304348
t = -\frac{346}{23} = -15\frac{1}{23} \approx -15.043478261
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