x= 7, y= 9 z =90
1) From the figure we can state
9x- 7 +5y-11 =90 ⇒ 9x +5y=90+11+7 ⇒ 9x +5y =108
13y+7 +9x-7=180 ⇒ 9x +13y = 180
8x +5y-11 +z= 180
⇒
2) Setting a Linear system:
9x +5y =108 Multiply by -1
9x +13y = 180
-9x -5y =-108
9x +13y = 180
--------------------------
8y = 72
y = 9
9x + 5(9)=108
9x +45=108
9x=108-45
9x=63
x=7
8x +5y-11 +z= 180
8(7) +5(9)-11 +z= 180
90+z=180
z=180-90
z=90
2) x= 7, y= 9 z =90