Answer:
For x
[tex]{ \rm{x + 130 \degree = 180 \degree}} \\ { \tt{ \{angles \: on \: straight \: line \}}} \\ { \rm{x = 180 \degree - 130\degree}} \\ { \boxed{ \rm{ \: x = 50\degree \: }}}[/tex]
For y:
[tex]{ \rm{y = x}} \\ { \tt{ \{isosceles \: triangle \}}} \\ { \boxed{ \rm{ \: y = 50\degree \: }}}[/tex]
For z
[tex]{ \rm{x + y + z = 180\degree}} \\ { \tt{ \{angle \: sum\: of \: a \: triangle} \}} \\ { \rm{50\degree + 50\degree + z = 180\degree}} \\ \\ { \boxed{ \rm{ \: z = 80\degree \: }}}[/tex]
