MATH / Below are the graphs of two functions, f(x) and g(x), defined on the domain 0≤x≤18: [asy] import graph; size(8cm); real lsf=0.5; pen dps=linewidth(0.7)+fontsize(10); defaultpen(dps…

Below are the graphs of two functions, f(x) and g(x), defined on the domain 0≤x≤18:

[asy]
import graph; size(8cm); real lsf=0.5; pen dps=linewidth(0.7)+fontsize(10); defaultpen(dps); pen ds=black; real xmin=-1.5,xmax=18.5,ymin=-1.5,ymax=12.5;

pen cqcqcq=rgb(0.75,0.75,0.75);

/*grid*/ pen gs=linewidth(0.7)+cqcqcq+linetype("2 2"); real gx=1,gy=1;
for(real i=ceil(xmin/gx)*gx;i<=floor(xmax/gx)*gx;i+=gx) draw((i,ymin)--(i,ymax),gs); for(real i=ceil(ymin/gy)*gy;i<=floor(ymax/gy)*gy;i+=gy) draw((xmin,i)--(xmax,i),gs);

Label laxis; laxis.p=fontsize(10);

xaxis("",xmin,xmax,Ticks(laxis,Step=2.0,Size=2,NoZero),Arrows(6),above=true); yaxis("",ymin,ymax,Ticks(laxis,Step=2.0,Size=2,NoZero),Arrows(6),above=true);
draw((0,10)--(2,10)--(8,4)--(10,4)--(18,12),darkgreen+1.5);
draw((0,2)--(6,8)--(10,8)--(12,10)--(18,10),orange+dashed+1.5);
[/asy]

If the graph of f(x) is the dashed orange line, and the graph of g(x) is the solid green line, what is the largest value of f(x)−g(x)?

Below are the graphs of two functions, $f(x)$ and $g(x)$, defined on the domain $0\le x\le 18$:

[asy]
import graph; size(8cm); real lsf=0.5; pen dps=linewidth(0.7)+fontsize(10); defaultpen(dps); pen ds=black; real xmin=-1.5,xmax=18.5,ymin=-1.5,ymax=12.5;

pen cqcqcq=rgb(0.75,0.75,0.75);

/*grid*/ pen gs=linewidth(0.7)+cqcqcq+linetype("2 2"); real gx=1,gy=1;
for(real i=ceil(xmin/gx)*gx;i<=floor(xmax/gx)*gx;i+=gx) draw((i,ymin)--(i,ymax),gs); for(real i=ceil(ymin/gy)*gy;i<=floor(ymax/gy)*gy;i+=gy) draw((xmin,i)--(xmax,i),gs);

Label laxis; laxis.p=fontsize(10);

xaxis("",xmin,xmax,Ticks(laxis,Step=2.0,Size=2,NoZero),Arrows(6),above=true); yaxis("",ymin,ymax,Ticks(laxis,Step=2.0,Size=2,NoZero),Arrows(6),above=true);
draw((0,10)--(2,10)--(8,4)--(10,4)--(18,12),darkgreen+1.5);
draw((0,2)--(6,8)--(10,8)--(12,10)--(18,10),orange+dashed+1.5);
[/asy]

If the graph of $f(x)$ is the dashed orange line, and the graph of $g(x)$ is the solid green line, what is the largest value of $f(x)-g(x)$?