Question: how can i solve this matrix ?

how can i solve matrix ?

for example :

Matrix(4, 4, {(1, 1) = 18, (1, 2) = -45, (1, 3) = 36, (1, 4) = -9, (2, 1) = 9, (2, 2) = -18, (2, 3) = 9, (2, 4) = 0, (3, 1) = 0, (3, 2) = 9, (3, 3) = -18, (3, 4) = 9, (4, 1) = -9, (4, 2) = 36, (4, 3) = -45, (4, 4) = 18})  Vector(4, {(1) = y(1), (2) = y(2), (3) = y(3), (4) = y(4)}) = Vector(4, {(1) = -0.7500000000e-2, (2) = 0.8333333330e-2, (3) = 0.3083333333e-1, (4) = 0.6000000000e-1})

and upper degree ?

thx,

Aryan

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