Nomor 1.

2x + y = 4 (×2)

5x - 2y = 1 (×1)

Menjadi

4x + 2y = 8

5x - 2y = 1

________ +

9x = 9

x = 9/9

x = 1

Substitusikan

2x + y = 4

2(1) + y = 4

2 + y = 4

y = 4 - 2

y = 2

●》 Kesimpulan

• x = 1
• y = 2
• (x, y) =(1, 2)

Nomor 2.

6x - 5y = 12

2x + 5y = 12

_________ +

8x = 24

x = 24/8

x = 3

Substitusikan

2x + 5y = 12

2(3) + 5y = 12

6 + 5y = 12

5y = 12 - 6

5y = 6

y = 6/5

●》 Kesimpulan

• x = 3
• y = 6/5
• (x, y) = (3, 6/5)

Nomor 3.

7x + 2y = 19 (×3)

4x - 3y = 15 (×2)

Menjadi

21x + 6y = 57

8x - 6y = 30

_________ +

29x = 87

x = 87/29

x = 3

Substitusikan

7x + 2y = 19

7(3) + 2y = 19

21 + 2y = 19

2y = 19 - 21

2y = -2

y = -2/2

y = -1

●》 Kesimpulan

• x = 3
• y = -1
• (x, y) = (3, -1)

Nomor 4.

3x + 3y = 3 (×4)

2x - 4y = 14 (×3)

Menjadi

12x + 12y = 12

6x - 12y = 42

___________ +

18x = 54

x = 54/18

x = 3

Substitusikan

3x + 3y = 3

3(3) + 3y = 3

9 + 3y = 3

3y = 3 - 9

3y = -6

y = -6/3

y = -2

●》 Kesimpulan

• x = 3
• y = -2
• (x, y) = (3, -2)

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