# SOLUTION: The graph of a function F(x)=mx + b contains the points (5,15) and (-3,-5). Find b.

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 Algebra: Graphs, graphing equations and inequalities Solvers Lessons Answers archive Quiz In Depth

 Click here to see ALL problems on Graphs Question 72826: The graph of a function F(x)=mx + b contains the points (5,15) and (-3,-5). Find b.Answer by rmromero(383)   (Show Source): You can put this solution on YOUR website!``` The graph of a function F(x)=mx + b contains the points (5,15) and (-3,-5). Find b. Formula for slope (m) m = __________ (,) = (5, 15) (,) = (-3, -5) -5 - 15 m = __________ -3 - 5 -20 5 = ______ or ___ - 8 2 To find the f(x), F(x) = mx + b , m = 5/2, (x, y) = (5, 15) 15 = (5/2)(5) + b 15 = 25/2 + b 15 - 25/2 = b 30/2 - 25/2 = b 5/2 = b F(x) = (5/2)x + 5/2 The graph looks like this ```