Question: How to make a plot with linear income functions?

How do I create a plot like Figure I as uploaded in the PDF-document?

On Figure I, you see the plot of two income functions. The income functions are defined by equations (5), (6), (7), and (8).
Please note that:
0<a<1
0<g<1
0<"tau"<1
0<"delta"*g<1
"delta" belongs to open interval (0,1)

/Regards.

IMG_499.pdf

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