What is the slope of the line that passes through points (2,5) and (8,3)

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Tim's phone service charges $26.39 plus an additional $0.21 for each text message sent per month. if tim's phone bill was $31.64, which equation could be used to find how many text messages, x, tim sent last month?

The vertices of a triangle are a(7.5), b(4,2), and c19. 2). what is