Question 1017602
13y = 20x + 3y simplifies to 

13y-3y=20x

10y=20x

y=2x

second eq 

13y + ( 8x + y ) = 180

14y+8x=180

substitute 

14(2x)+8x=180

28x+8x=180

36x=180

x=5

y=10