bagi yang mengerti SPNLDV tolong jawab soal no.13&14 y

13.]
Misal 1/(2x + 3y) = a
1/(3x - 2y) = b

½ a + ¹²/₇ b = ½ [x 14]
➙ 7a + 24b = 7
➙ 7a + 4b = 2
––––––––––––– (–)
20b = 5
b = ¼

1/(3x - 2y) = ¼
3x - 2y = 4 |x 2| 6x - 4y = 8 ... (i)

Subtitusikan
7a + 4(¼) = 2
7a = 2 - 1
7a = 1
a = ⅐

1/(2x + 3y) = ⅐
2x + 3y = 7 |x 3| 6x + 9y = 21 ... (ii)

Eliminasi (i) dan (ii)
6x - 4y = 8
6x + 9y = 21
––––––––– (–)
-13y = -13
y = -1

Subtitusikan
2x + 3y = 7
2x = 7 - 3(-1)
2x = 10
x = 5

HP : {5 , -1}

14.]
Misal 1/x = a , 1/y = b
2a + 3b = 6 ... (i)

a + ½ b = 2 |x 2| 2a + b = 4 ... (ii)

Eliminasi (i) dan (ii)
2a + 3b = 6
2a + b = 4
––––––––– (–)
2b = 2
b = 1
1/y = 1
y = 1

2a + b = 4
2a = 4 - 1
2a = 3
a = ³/₂
1/x = ³/₂
x = ⅔

HP : { ⅔ , 1 }

Ya cari lah mas bro wkwk