bantu saya jawab no 7&8 ,dengan caranya

7)
Diketahui :
• a + b = 6
• a - b = 2
• 2a - b = c

Ditanya :
a = ?
b = ?
c = ?

Jawab :
a + b = 6
a - b = 2
_______ +
2a = 8
a = 8/2
a = 4

a - b = 2
4 - b = 2
b = 4 - 2
b = 2

2a - b = c
2(4) - 2 = c
8 - 2 = c
6 = c
c = 6

Jadi
a = 4
b = 2
c = 6

8)
Diketahui :
A transpose = B
Maka
• a = 2
• b = 3a
• c = ½b
• d = c²

Ditanya :
a = ?
b = ?
c = ?
d = ?

Jawab :
• a = 2

• b = 3a
b = 3(2)
b = 6

• c = ½b
c = ½(6)
c = 3

• d = c²
d = 3²
d = 9

Jadi
a = 2
b = 6
c = 3
d = 9