ODE45 and dsolve result difference

Hi, i am struggling to get similar answer using ODE45 and dsolve. I dont know whats wrong? if any one can help, please.

-----------code using dsolve-------------------

syms x y(x)
Dy = diff(y);
Eq= diff(y,x,2)==2-2*Dy-8*x;
cond1 = y(0) == 1;
cond2 = Dy(0) == -2;
conds = [cond1 cond2];
Sol = dsolve(Eq,conds)

Sol = 

fplot(Sol,[0 2])

-----------code using ODE45-------------------

[x,y]=ode45(@twofirstorder,[0 2],[1 -2]);
plot(x,y)

function dydx = twofirstorder(x,y)
dydx(1)=y(2);
dydx(2)=2-2*y(2)-8*y(1);    
dydx=dydx';
end

Answer 1

[Torsten]

dydx(2)=2-2*y(2)-8*x;

instead of

dydx(2)=2-2*y(2)-8*y(1);

[Muhammad Asad]

amazing, thanks