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p= pensil
b=3p
2b+5p=55
4p=?
2b+5p=55
2(3p)+5p=55
6p+5p=55
11p=55
p=55/11
p=5
b=3p
=3(5)
=15
jadi harga 1 pensil Rp. 500 dan harga 1 buku Rp 1.500
jadi berapakah harga 4p=?
4(500)=2000
Jadi harga 4 pensil Rp. 2.000
persamaan : 1) x=3y
2) 2x+5y=5500
ditanya : harga 4 pensil (4x)
jawab : 2x+5y=5500
2(3y)+5y=5500
6y+5y=5500
11y=5500
y=500
x=3y
x=3(500)
x=1500
jadi harga 4 pensil= 4(500)
= 2000