pleasee bantuin SPDLV dari nmr 8 sampai nmr 10 makasihh:)

8. permisalan= Baju: x dan kaos : y
2x+y= Rp170.000x1
x+3y= Rp185.000×2

2x+y=Rp170.000
2x+6y=Rp370.000
_______________-
-5y= Rp - 200.000
y=Rp -200.000/-5
y=Rp40.000

2x+y=Rp170.000
2x+40.000=Rp170.000
2x=Rp170.000-40.000
2x=Rp130.000
x=Rp130.000/2
x=Rp65.000

ditanya =
3baju dan 2kaos= ...?
3x+2y
(3×65.000)+(2×40.000)
195.000+80.000= Rp275.000
Jawabannya A

8.
2x + y = 170000 ¦ x1 → 2x + y = 170000
x + 3y = 185000 ¦ x2 → 2x + 6y = 370000
____________ -
-5y = -200000
y = -200000 : -5
y = 40000

x +3y = 185000
x + 3(40000) = 185000
x + 120000 = 185000
x = 185000 - 120000
x = 65000

3x + 2y
3(65000) + 2(40000)
195000 + 80000
275000

9.(kurang tahu maaf)

10.

bebek = x
kambing = y

x + y = 15. ¦ x2 → 2x + 2y = 30
2x + 4y =40 ¦ x1 → 2x + 4y = 40

-2y = -10
y = -10 : -2
y = 5