clc
clear

disp "Taylor Waller"

x = -3:0.01:3;

y = 3*x.^4 - 6*x.^3 + 8*x.^2 + 4*x + 90;
z = 3*x.^3 + 5*x.^2 - 8*x + 70;

plot (x,y,x,z)
xlabel('Voltage (V)')
ylabel('Current (mA)')
legend('y','z')
grid on;