Which of the Following Systems Are Linear? Select All That $\frac { d x } { d t } = x + y ^ { 2 } , \frac { d y } { d t } = 2 x - 3 y$

Multiple Choice

Which of the following systems are linear? Select all that apply.

A) $\frac { d x } { d t } = x + y ^ { 2 } , \frac { d y } { d t } = 2 x - 3 y$
B) $\frac { d x } { d t } = x + t , \frac { d y } { d t } = 2 x - 3 y$
C) $\frac { d x } { d t } = x + y , \frac { d y } { d t } = 2 x - 3 y$
D) $\frac { d x } { d t } = 0 , \frac { d y } { d t } = 2 \sin x - 3 y$
E) $\frac { d x } { d t } = t + 1 , \frac { d y } { d t } = 15 x - 4 y$