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Part $1$

Find a function

Bold r left parenthesis t right parenthesisr$($t$)$

that describes the line passing through

Upper P left parenthesis $4$ comma $2$ comma $5$ right parenthesisP$(4,2,5)$

and

Upper Q left parenthesis $8$ comma $3$ comma $4$ right parenthesisQ$(8,3,4).$