Question

c.
(b) 7+9a - 76,2b + 4a - 6​

Answer 1

Answer:

Diketahui:

( 2a 7 b 6 ) + ( 5 −3 3c 2b ) = ( 15 4 a a − 1 )

Ditanya:

nilai dari a − 2b − c ?

Dijawab:

2a + 5 = 15

7 - 3 = 4

b + 3c = a

6 + 2b = a -1

2a + 5 = 15

2a = 15 - 5

2a = 10

a = 5

6 + 2b = a - 1

6 + 2b = 5 - 1

6 + 2b =  4

2b = 4 - 6

2b = - 2

b = -1

b + 3c = a

-1 + 3c = 5

3c = 5 + 1

3c = 6

c = 2

Nilai a = 5, b = -1, c = 1

Nilai a − 2b − c = 5 - 2(-1) - 1 = 5 + 2 - 2= 5

jadi, nilai  a − 2b − c = 6