# Plot-region depending of the interacted value

How to have the plot dependent of the solved value `a`

. The following code conducts to an error

def _(c=slider(0,1,step_size=0.2,default=1)):

a = solve(-c*x+6==x, x)

g = plot(x,(0,10),color="blue",ymin=0,ymax=10)

h = plot(-c*x+6,(a,6),color="yellow",ymin=0,ymax=10)

show(g+h)

`a = solve(-c*x+6==x, x)`

gives a list with an equation in it`[x==(30/7)]`

. Use`a[0].right()`

to get the value, which can then be used in a coordinate pair.Thanks a lot