questions below:

Express the system of differential equations in matrix notation. x1 = 6x1-4x2+x3-x4 x2 = 7x1 +2x4 X3, = ' EM '4x3 x4' 0 Write the system of equations using matrix notation. Select the correct choice below and ll in the answer box to complete your choice. (Type an exact answer.) X1 x1 x2' x2 0 A. , = D X3 X3 / X4 X4 _ / _ _ / X3 x1 x3 x1 0 B' / = / X4 X2 X4 X2 _ / _ _ / X1 X3 x1 *3 O c' / = / X2 X4 X2 X4 Determine whether the equation is exact. If it is, then solve it. (3x 2y + 8) dx + (x3 - 1) dy=0 . . . Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. The equation is exact and an implicit solution in the form F(x,y) = C is = C, where C is an arbitrary constant. (Type an expression using x and y as the variables.) O B. The equation is not exact