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Buku = x
Pensil = y
8x + 6y = 22.000 | x1 | 8x + 6y = 22.000
4x + 2y = 10.000 | x2 | 8x + 4y = 20.000 _
2y = 2.000
y = 1.000
4x + 2y = 10.000
4x + 2(1.000) = 10.000
4x + 2.000 = 10.000
4x = 8.000
x = 2.000
10 buku + 8 pensil
=10x + 8y
=10(2.000) + 8 (1.000)
=20.000 + 8.000
=28.000
Jadi,harga 10 buku dan 8 pensil = Rp 28.000
2. 2x - 3y = 0
-3y = -2x
y =
m =
m1 .m2 = -1
. m2 = -1
m2 = -
y - y1 = m(x - x1)
y - 3 = (x + 1)
y - 3 = x 2
2y - 6 = 3x + 3
2y = 3x + 3 + 6
2y = 3x + 9
Jadi,persamaan garisnya adalah 2y + 3x = 9
3. Sisi = 6
Rusuk = 10
~Semoga membantu(:
pencil =b
8a+6b=22.000
4a+2b=10000
8a+6b=22000-
8a+4b=20000
2b=2000:2
1b=1000
8a+6b=22000
8a+6000=22000
8a=22000-6000
8a=16000
a=2000
1 pencil =1000x8=8000
1buku=2000x10000=20000
8000+20000=28000