U1=3 U5+48=61 Berapakah U11=.......?

U1 = a = 3
U5 + 48 = 61
a + 4b = 61 - 48
3 + 4b = 13
4b = 13 - 3
4b = 10
b = 10/4
b = 5/2

U11 = a + 10b
U11 = 3 + 10.5/2
U11 = 3 + 25
U11 = 28

semoga membantu.