Question

QUGAS
1. Penyelesaian system persamaan dari 2x + 3y = 26 dan 3x + 4y = 37 adalah x dan y. Nilai x - y adalah ....
A. -69
C. 28
B. 11
D. 63

Answer 1

Jawaban:

E

Penjelasan dengan langkah-langkah:

SPLDV

3x + 4y = 37

2x + 3y = 26 –

x + y = 11

(×3) 9x + 12y = 111

(×4) 8x + 12y = 104 –

x = 7

x + y = 11

7 + y = 11

y = 4

x – y = 7 – 4

x – y = 3 ✔

Answer 2

SOAL 1

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Cari Nilai x Atau y :

2x + 3y = 26 | × 3 | [ Pers 1 ]

3x + 4y = 37 | × 2 | [ Pers 2 ]

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Eliminasi Nilai x :

6x + 9y = 78

6x + 8y = 74

___________ -

y = 4

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Subtitusikan Nilai y Ke Pers 1 :

2x + 3(4) = 26

2x + 12 = 26

2x = 26 - 12

2x = 14

x = 14/2

x = 7

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x - y

= 7 - 4

= 3 [ No Opsi ]

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