Write the given system of secondorder equations as an equiva

Write the given system of second-order equations as an equivalent system of first order equations. x\" + 6x\' - 2.5x + 18y = 0.5t y\" + 3y\' - 15x + 2y = -7.5 cos (t) Use x_1 to represent the function x. and use x_2 to represent the first derivative, i.e. x_2 = x\'(t), and so forth. Write x1, x2, etc., for these functions. If you do not need to use a particular answer box. write NA.

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