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Which of the following equations holds true for the following signal flow graph?

Which of the following equations holds true for the following signal flow graph? Correct Answer x<sub>2</sub> = A<sub>21</sub>x<sub>1</sub> + A<sub>23</sub>x<sub>3</sub>

To write the state equation of any signal flow graph at any point or junction, we only consider input response or incoming response at that point or junction.

Hence state equations of given signal flow diagram can be written as

X2 = A21 X1 + A23 X3

X4 = A42 X2 + A43 X3

X3 = A31 X1 + A32 X2 + A33 X3

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