Habisin poin O-o Terlampir! ​

• Ubah bentuk 4x + y = 9

4x + y = 9

y = 9 – 4x

• Substitusi ke x + 4y = 6

x + 4(9 – 4x) = 6

x + 36 – 16x = 6

-15x + 36 = 6

-15x = 6 – 36

-15x = -30

x = 2

• Substitusi nilai x

y = 9 – 4x

y = 9 – 4(2)

y = 9 – 8

y = 1

__

2x + 3y

= 2(2) + 3(1)

= 4 + 3

= 7

• Persamaan

4x + y = 9 … (1)

x + 4y = 6 … (2)

• Nilai x

16x + 4y = 36

x + 4y = 6

_____________-

15x = 30

x = 2

• Nilai y

→ x + 4y = 6

→ 2 + 4y = 6

→ 4y = 6 – 2

→ 4y = 4

→ y = 1

• Nilai 2x + 3y

→ 2x + 3y

→ 2(2) + 3(1)

→ 4 + 3

→ 7