Jawaban:

Dalam format: {x, y}

1. {0, 6}

2. {4, 8}

3. {2, 1}

4. {7, 1}

Penjelasan dengan langkah-langkah:

1.

3x+2y= 12

3x= 12-2y

x= (12-2y)/3

2x+3y= 18

2(12-2y)/3 + 3y= 18

24-4y/3 + 3y= 18

(24-4y+9y)/3= 18

24+5y= 54

5y= 30

y= 6

x= (12-2(6))/3

x= 0/3

x= 0

HP= {0, 6}

2.

x+y= 12

x= 12-y

3x-y= 4

3(12-y)-y= 4

36-3y-y= 4

36-4y= 4

-4y= -32

y= 8

x= 12-y

x= 12-8

x= 4

{4, 8}

3.

x+2y= 4

x= 4-2y

2x-y= 3

2(4-2y)-y= 3

8-4y-y= 3

8-5y= 3

-5y= -5

y= 1

x= 4-2(1)

x= 2

{2, 1}

4.

2x-4y= 10

x-2y= 5

x= 5+2y

x+2y= 9

5+2y+2y= 9

5+4y= 9

4y= 4

y= 1

x= 5+2(1)

x= 7

{7, 1}