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a + 2b = 11
U10 = a + 9b
a + 9b = 39
a + 2b = 11
7b = 28
b = 4
a + 2b = 11
a + 8 = 11
a = 3
U1 = 3
beda = 4
U3=11, U10=39
U3=a+(n-1)b
11=a+(3-1)b
11=a+2b.....persamaan1
U10=a+(n-1)b
39=a+(10-1)b
39=a+9b......persamaan 2
eliminasi persamaan 1 dan 2
a+9b=39
a+2b=11
7b=28
b=28/7
b=4
substitusi ke persamaan1
a+2b=11
a+2(4)=11
a+8=11
a=11-8
a=3