Set (15x+25) equal to (6x+79) since they’re across from each other, they’re equal. Then solve for X
Since you solved for x, plug it in to either equation and then the answer to that plus z would equal 180°, because that’s the degree of the flat line. So it would look like 180 minus the number you solved for with x, would equal z.
Hope that helped! If you have follow up question or still don’t understand I’d be happy to help!
