Multiple choice

The input and output of a continuous time system are respectively denoted by x (t) and y (t). Which of the following descriptions corresponds to a casual system?

  1. y (t) = x (t - 2) + x (t + 4)

  2. y (t) = (t - 4) x (t + 1)

  3. y (t) = (t + 4) x (t - 1)

  4. y (t) = (t + 5) x (t + 5)

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation