Question

Sistem persamaan linier dua variabel {SPLDV}
1) 4p + 3q = -4 dan 3p - 2q = 14, jika p - 3q = ....?
2) 2x + 3y = 26 dan 3x + 4y = 37, jika xy =....?
3) x/2 + y-6/3 = 6 dan x - y = 1, jika 2x + 3y =....?
minta bantuannya yaa, kalian boleh ngerjain pake metode eliminasi atau subtitusi kok. mmm saran aku sih, kalian ngerjainnya dibuku tulis trus difoto ajaa yaa:) Thx

Answer 1

1) 4p+3q = -4 |x2| 8p+6q = -8
3p-2q = 14 |x3| 9p-6q = 42
------------------ +
17p = 34
p = 2
4p+3q = -4
4(2)+3q = -4
8+3q = -4
3q = -12
q = -4

p-3q ------> 2-3(-4) -------> 2+12 = 14

2) 2x+3y = 26 |x3| 6x+9y = 78
3x+4y = 37 |x2| 6x + 8y = 74
---------------- -
y = 4
2x+3y = 26
2x+3(4)=26
2x+12=26
2x=14
x = 7

xy ----> 7.4 = 28

3) x/2+y-6/3 = 6
x-y = 1

x/2+y = 6+6/3
x/2+y = 8

x/2+y = 8 |x2| x+2y = 16
x-y = 1 |x1| x-y = 1
-------------- -
3y = 15
y = 5
x-y = 1
x-5 = 1
x = 6

2x+3y -----> 2(6)+3(5) -------> 12+15 = 27