Need help please in function output

Hi

I am trying to build function to obtain different results upon changing of variables So I need help please

Below is the code

clc;

syms x y real;

neg=solve(-15 == 10*x+2*y,y)

pos=solve(10*x+2*y == 20,y)

yinterval = [ neg,pos]

myfunc(10) % to see the results of neg, and pos if x=100

%% Add function

function myfunc(x)

neg=input('enter equation ') % I have written yinterval(1) %% (got error of undefined variable )

pos=input('enter equation ') %% (got error of undefined variable )

yin(:,1)=[cc,mm]

end

ANy help!

[John D'Errico]

Please stop posting the same question over and over again.