"keniako " <email@example.com> wrote in message news:firstname.lastname@example.org... > We have x(t;?) and y(t;?) of a Cauchy problem > > x?=4x+?y+3?^t > y?=?x+y+?^t > x(0)=1,y(0)=1) > > Where ? ? R and ' derivative of t.
Many of the characters in your posting appeared as question marks. Reply with a plain text statement of the problem along with information about what you've already tried to solve the exercise and someone may offer suggestions.