Chapter 1 Problems solution 117y()=x(sin(t) (a) Is this system causal? (b) Is this system linear? (a) No y(-x)=x(sin(-z)=x(0) (b) Yes.Chapter 1 Problems Solution 1.17 y(t) = x(sin(t)) (a) No. y(− )= x(sin(− ))= x(0) (b) Yes. (a) Is this system causal? (b) Is this system linear?