The lines a and b intersect at point D.

What is the value of z?

z =
the graph is below:
http://static.k12.com/calms_media/media/1561000_1561500/1561011/1/78faf1bd5c48a3fe68a305b005ddfd42afbabb12/MS_IMC-1401104-109024.jpg

Question

The lines a and b intersect at point D.

 

What is the value of z?

 

z =    
the graph is below:
http://static.k12.com/calms_media/media/1561000_1561500/1561011/1/78faf1bd5c48a3fe68a305b005ddfd42afbabb12/MS_IMC-1401104-109024.jpg

compassionate · Answer

Okay. We know these are opposite angles, so they're going to be equal. Simply plug it into an equation 5z + 8 = 4 + 20 then solve

anonymous · Answer

can you show me how to do it so I can do the others myself

compassionate · Answer

Take 

5z + 8 = 4z + 20

Then solve for z