Sistem persamaan dari…​

(x+5+12)/3 = y-7

x + 17 = 3y -21

x – 3y = -38..(pers 1)

(6x + 2y-18)/2 = -23

6x + 2y -18 = -46

6x + 2y = -28

3x + y = -14..(pers 2)

eliminasi

x – 3y = -38 |x3| 3x -9y = -114

3x + y = -14 |x1| 3x +y = -14

——————————————— –

-10y = -100

y = 1

x -3y = -38

x -30 = -38

x = –8

a = x = -8

b = y = 10

2a – b = 2(–8)–10 = –16–10 = –26