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HELP

function f(x) { y =  12*x + 20; return y }

aX = 0; bX = 20; aY = 0; bY = 300
Dx = 1; Dy = 20

Q1x=[1,5,10,20]; Q1y=[f(1),f(5),f(10),f(20)]
C1="green"; L1x=[0,15,15]; L1y=[200,200,0]
xx=[5,10,15,20]; yy=[100,200,300]

AX=BX=AY=BY=""
BX="cent"; BY="N"

T0=["0",0,-10]; T1=["5",5,-10]; T2=["10",10,-10]; T3=["15",15,-10]; T4=["20",20,-10]
T5=["0",-0.5,0]; T6=["100",-0.8,100]; T7=["200",-0.8,200]; T8=["300",-0.8,300]