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Verified answer
(P - 8000)/(10000 - 8000) = (Q - 1000) / (800 - 1000)(P - 8000) / 2000 = (Q - 1000) / -200
(P - 8000) / -10 = Q - 1000
P - 8000 = -10Q + 10000
P = -10Q + 18000
P - 18000 = -10Q
Q = -0,1P + 1800