%% Student example 1

syms s cp cinj co
eqn1 = 2*cinj + 5*12*co - 7*2*cp - 3*2*cp == 2*s*cp;
eqn2 = 12*s*co == 7*cp*2 - 5*co*12;
[cp,co]=solve([eqn1,eqn2],[cp,co]);
co/cinj