Question

Penyelasaian 5x-y=8 dan 2x+3y=27 adalah p dan q maka nilai 2p-q=...

Answer 1

5x -y = 8 ----------> y = 5x -8
2x +3y = 27

2x +3y = 27
2x +3(5x -8) = 27
2x +15x -24 = 27
17x = 27 +24
17x = 51
x = 51/17
x = 3

y = 5x -8
   = 5(3) -8
   = 15 -8
   = 7

x = p
y = q

Maka,
p = 3
q = 7

2p -q
= 2(3) -7
= 6 -7
= -a

Itu jawabannya.

Answer 2

5x-y = 8 |x3| 15x - 3y = 24
2x+3y = 27 |x1| 2x + 3y = 27
____________ +
17x = 51
x = 51/17
x = 3

x = 3 --------->> 5x - y = 8
5.3 - y = 8
15 - y = 8
- y = 8-15
- y = -7 ------->> y = 7

jadi, 2p-q = 2.3 - 7 = 6-7 = -1