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HELP

function f(x) { y =  -5/3*(x-1.5)+3.5; return y }

aX = -2; bX = 5; aY = -0.5; bY = 6.5
Dx = 1/2; Dy = 1/2

C1="red"; Q1x=[-1,4]; Q1y=[2,5]; L1x=Q1x; L1y=Q1y; Q2x=[(Q1x[0]+Q1x[1])/2];  Q2y=[(Q1y[0]+Q1y[1])/2]

AX=BX=AY=BY=""

T0=["0",0,-0.8]; T1=["-2",-2,-0.8]; T2=["2",2,-0.8]; T3=["4",4,-0.8]
T5=["0",-2.3,0]; T6=["2",-2.3,2]; T7=["4",-2.3,4]; T8=["6",-2.3,6]
s0=["A",-1.25,2.25]; s1=["B",4.25,5.25]