tolong dong besok dikumpulin sama jalan nya ya

1. a + 5 = 1
a = -4

Maka, U10 = (-4) + 9.5
= -4 + 45
= 41

2. a + 2b = 12
a + 7b = 27
-5b = -15
b = 3

a + 6 = 12
a = 6

Maka,
U18 = 6 + (17.3)
= 6 + 51
= 57

jawabannya ada di foto bila ada kesalahan boleh di tanyakan