ezplot('x-0.8*x^2+1.5*y',[-4,3,-1,5])
hold on
ezplot('x-1+y-sin(x-y)',[-4,3,-1,5])
grid on
legend('x-0.8*x^2+1.5*y','x-1+y-sin(x-y)')
title('3. ülesande graafik')