Question

TOLONG DIKERJAKAN PLIIIS SAYA KASIH POIN BANYAK

Answer 1

Penjelasan dengan langkah-langkah:

• Nomer 1a

4x+4y =10

4x - 3y = -18

__________-

7y = 28

y = 4

subtitusi

2x + 2(4) = 5

2x = -3

x = -3/2

• Nomer 1b

10x + 2y = 2

4x - 2y = -6

_________+

14x = -4

x = -2/7

y = 9/35

• Nomer 1C

3x - 2y = 7

8x + 2y = 26

_________+

11x = 33

x = 3

y = 1

• Nomer 2a

0,5x + 0,2y = -1

0,25x - 0,2y = -2

____________+

0,75x = -3

x = -4

y = 5

• Nomer 2b

x- 3y = -3

4,5x + 3y = -18

____________+

5,5x = -21

x =  -3,81

y = 14,43

• Nomer 2c

x+6y =37

24x - 6y = 186

___________+

25x = 223

x = 8,92

y= 4,68

• Nomer 3

x² + y² =20

x²-y²=12

_________+

2x² = 32

x² = 16

x = 4

subtitusi

(4)² + y² =20

y² = 4

y = 2

• Nomer 4

10b + 2p =162 :2

5b + 4p = 99

5b + 4p = 99

5b + p = 81

__________-

3p = 18

p = 6

subtitusi

5b = 75

b = 15

nilai 7b + 4p

7(15) + 4(6)= 129

Jadi harga 7 buku 4 pensil adalah Rp. 12900

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Mapel : Matematika

Kelas : VIII

Kategori : SPLDV