% (1.81,17.3) (-2.08,17) (4.7, -20.02) (-1.6, 7.801) (2.22, 19.2) (-0.3,1.8)

x = [-2.08 -1.6 -0.3 1.81 2.22 4.7];
y = [17 7.801 1.8 17.3 19.2 -20.02];

graph = polyfit(x,y,3);
plot(polyfit(x,y,3),'r--')