g=ezplot('x^2+y^2=4',[-2,2,-3,3])
set(g,'Color','r')
hold on
h=ezplot('10*x^2+y^2-9=0',[-2,2,-3,3])
set(h,'Color','k')
hold off
grid on
legend('x^2+y^2=4','10x^2+y^2=9')
title('Selle tunni viimane ülesanne')