kerjakan di atas dengan benar.

a) u10=a+9b=7
u14=a+13b=15

a+9b=7
a+13b=15
________-
-4b= -8
b=2

substitusi b=2
a+9b=7
a+9(2)=7
a= -11

b) u6 =a+5b= 5
u12=a+11b= -13
_________ -
-6b=18
b= -3

a+5b=5
a+5(-3)=5
a=20

C)u4=a+3b=13
u10=a+9b=31
________-
-6b= -18
b= 3

a+3b=13
a+3(3)=13
a=4


d) u4=a+3b=5
u6-u1=a+5b-a
5=5b
b=1

a+3b=5
a+3(1)=5
a=2

f) u5=a+4b=14
u13=a+12b= -18
__________ -
-8b=32
b= -4

a+4b=14
a+4(-4)=14
a=30