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buku = b
4a + 5b = 19.000
3a + 4b = 15.000
b. 4a + 5b = 19.000 X 3
3a + 4b = 15.000 X 4
____________________
12a + 15b = 57.000
12a + 16 b = 60.000
________________
-b = - 3000
maka harga 1buku = 3.000
3a + 4b = 15.000
3a + 4(3000) = 15.000
3a = 15.000 - 12.000
3a = 3000
a = 1.000
harga pensil 1.000
3x+4y=15000
b)4p+5y=19000
3x+4y=15000
---------------------------(kedua ruas dikali 4 dan 5)
16p+20y=76000
15x+20y=75000
------------------------(keedua ruas di kurangkan)
x=1000
4x+5y=19000
4(1000)+5y=19000
4000+5y=19000
5y=19000-4000
=15000
y=15000/5
=3000
jadi,harga 1 buah pensil=rp 1.000,00 dan 1 buiah buku tulis=Rp 3.000,00
mohon jadikan jawbanm terbaik