x= buku y= pensil jadi, 8x+6y=25.000 6x+5y=19.500 dit: 5x+8y? jwb:
· 8x+6y=25000 8x=25000-6y
· 6x+5y=19.500
5y=19500-6x
8x=25000-6(19500-6x)
8x=25000-117000+36x
8x=-92.000+36x
92000=36x-8x
92000=28x x=92000/28 x=23000/7
5y=19500-6(23000/7) 5y=19500-138000/7 5y=-1500/7 y= -7500/7
Jadi,
5x+8y= 5(23000/7)+8(-7500/7)
=11500/7-60000/7
=55000.
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x= buku
y= pensil
jadi,
8x+6y=25.000
6x+5y=19.500
dit:
5x+8y?
jwb:
· 8x+6y=25000
8x=25000-6y
· 6x+5y=19.500
5y=19500-6x
8x=25000-6(19500-6x)
8x=25000-117000+36x
8x=-92.000+36x
92000=36x-8x
92000=28x
x=92000/28
x=23000/7
· 6x+5y=19.500
5y=19500-6(23000/7)
5y=19500-138000/7
5y=-1500/7
y= -7500/7
Jadi,
5x+8y= 5(23000/7)+8(-7500/7)
=11500/7-60000/7
=55000.
smg mmbntu.