Question

Diketahui sistem persamaan linear 2x + 5y = 3 dan x + 3y = 1 , maka nilai dari 3x adalah ...

a.
12

b.
6

c.
3

d.
9


tolong ya makasii

Answer 1

Jawaban:

2x + 5y = 3

x + 3y = 1 , x = 1 - 3y

2(1 - 3y) + 5y = 3

2 - 6y + 5y = 3

-y = 1

y = -1

x = 1 - 3(-1)

x = 1 + 3

x = 4

Nilai 3x = 3(4) = 12

Answer 2

3x = 12

opsi A

pembahasan :

persamaan linear

2x + 5y = 3 --(×1)

x + 3y = 1 --(×2)

2x + 5y = 3

2x + 6y = 2

----------‐--------(-)

-y = 1

y = -1

x + 3y = 1

x + 3(-1) = 1

x = 1+3

x = 4

3x = 3×4 = 12