SOLUTION: solve for x <pre> ___________ ___________ \ / \ /

Algebra ->  Triangles -> SOLUTION: solve for x <pre> ___________ ___________ \ / \ /       Log On


   

Question 1108102: solve for x
                    ________________________
                    \                      /
                     \                    /
                    12\                  /2x
                       \                /
                        \______________/
                         \            /
                        9 \          /x+4
                           \        /
                            \      /
                             \    /
                              \  /
                               \/

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
solve for x
                    ________________________
                    \                      /
                     \                    /
                    12\                  /2x
                       \                /
                        \______________/
                         \            /
                        9 \          /x+4
                           \        /
                            \      /
                             \    /
                              \  /
                               \/

---------
(12+9)/9 = (2x+x+4)/(x+4)
21/9 = (3x+4)/(x+4)
Cross multiply
21(x+4) = 9*(3x+4)
21x + 84 = 27x + 36
48 = 6x
x = 8