Rewrite the given system of two second order equations where y(t) = 3u" (6 ln t)u - 3u' - e'v' + 9 sint u' v" -e²2¹u+2v+ +5t³v'+t-3 t = = as a system of four first order linear equations of the form y' = P(t)y + g(t) y₁ (t) u(t) Y₂(t) u' (t) Y3 (t) v(t) Y₁(t) v' (t) =

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A: To Sketch: the graph of  4x2-9y2=9(z2+4).

Q: please

A: We use definition of Heaviside function.

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