1. Penyelesaian dari sistem persamaan 2x + y = 3 dan x - y = 3 adalah..... 2. Harga 8 ekor kambing dan 3 ekor sapi adalah Rp. 3.000.000,-. Harga 6 ekor kambing

1. 2x+y=3
x -y=3 ====> 2-y=3==> -y=1==> y= -1
------------ +
3x =6
x =2
2. kambing = x
sapi = y
8x+3y=3000000|x4| 32x+12y=12000000
6x+4y=3650000|x3| 18x+12y= 10950000
----------------------------- -
14x = 1050000
x=75000
8(75000)+3y=3000000
600000+3y=3000000
3y=2400000==> y=800000

3x+2y = 3(75000)+2(800000)
=225000+1600000
= 1825000

SATU
2x + y = 3
x - y = 3
------------- +
3x = 6
x = 2

2 - y = 3
y = -1

DUA
8x + 3y = 3.000.000 |x4
6x + 4y = 3.650.000 |x3

32x + 12y = 12.000.000
18x + 12y = 10.950.000
---------------------------------- -
14x = 1.050.000
x = 75.000

y = (3.000.000 - 8(75.000)) ÷ 3
y = 800.000

3x + 2y = ....
3(75.000) + 2(800.000) = 1.825.000