The line of demarcation established a boundary between spain and portugal.
a. true
b. false

The Line of Demarcation between Spanish and Portuguese territory was first defined by Pope Alexander VI (1493) and was later revised by the Treaty of Tordesillas (1494). Spain won control of lands discovered west of the line, while Portugal gained rights to new lands to the east. 
The idea of this was to separate distinctively the colonies of Spain (most of latin america) and Portugal (Brazil and most of Africa) thus avoiding a war.

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Sorry sir you did not give us the graph i typically but i'm very confused my conclusion is you're missing valuable information in the question