tolong bantu jawab yh kak

u5=a+4b=14
u8=a+7b=29

a+7b=29
a+4b=14
________-
3b= 15
b=5

a+4b=14
a+4(5)=14
a = -6

u12=a+11b
= -6+11(5)
= -6+55
= 49

u1,u2,u3,u4,u5,u6,u7,u8,u9,u10
a,a+b,a+2b,a+3b,a+4b,a+5b,a+6b,a+7b,a+8b,a+9b
-6,-1,4,9,14,19,24,29,34,39