Question

menentukan y eliminasi x
7×-y=2
×+3y=16

​

Answer 1

7x - y = 2 --->x1

x + 3y = 16 --->x7

_____________

7x - y = 2

7x + 21y = 112

_____________-

- 22y = - 110

y = 5

7x - y = 2 --->x3

x + 3y = 16 --->x1

_____________

21x -3y = 6

x + 3y = 16

_____________+

22x = 22

x = 1

Jadi, hp nya {1, 5}

Answer 2

Penjelasan dengan langkah-langkah:

Spldv

• eliminasi

7x - y = 2 || ×3

x + 3y = 16 || ×1

.

[tex]\it{{{{21x - \cancel3y = 6}}}}[/tex]

[tex]\it \underline{{{{1x + \cancel3y = 16 \: (+)}}}}[/tex]

[tex]\it \red{{{{22x = 22}}}}[/tex]

[tex]\it \red{{{{x = \frac{22}{22} }}}}[/tex]

[tex]\it{{{{x = 1}}}}[/tex]

• subtitusi kan pers (2)

x + 3y = 16

1 + 3y = 16

3y = 16 - 1

3y = 15

y = 15/3

y = 5

• pembuktian

→ 7x - y = 2

7(1) - 5 = 2

7 - 5 = 2

→ x + 3y = 16

1 + 3(5) = 16

1 + 15 = 16