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If m angle ABD=79 degrees , what are m angle ABC and m angle DBC​

 

 Aug 28, 2020
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If m angle ABD=79 degrees , what are m angle ABC and m angle DBC​    

 

Since together they equal 79o just add them together, solve for x, and then plug it back in. 

 

                                              ABC    + DBC       =  ABD   

 

                                             (8x – 3) + (5x + 4)  =  79  

 

add like terms                         13x + 1  =  79  

                                                     13x  =  78         

                                                         x  =  6 

 

Plug 6 back in to ABC             (8 • 6) – 3  =  45      so    angle ABC = 45o      

 

Plug 6 back in to DBC             (5 • 6) + 4  =  34      so    angle DBC = 34o   

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 Aug 28, 2020

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