Question

Diberikan SPLTV berikut
3a - b + 2c = 16
2a + b + c = 1
4a - b+ c = 18
nulai dari a - b + c =

Answer 1

3a-b+2c=16 => b = 3a+2c-16

2a + 3a+2c-16+c=1
=5a+3c=17

4a -3a -2c+16+c =18
a-c=2

5a+3c=17 x 1
a-c=18 x3

5a+3c =17
3a-3c=54
8a=71
a=71/8

a-c =18
71/8-c=18
c = 71/8-144/8
c=-73/8

b =3a+2c-16
b= 3(71/8) + 2(-73/8) -16
b= 213/8 - 146/8 - 128/8
b= -61/8

a-b+c = 71/8 - (-61/8) + (-73/8)
= 59/8