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y= garpu
4x+5y=54.900 |kali 1
2x+3y=30.700 |kali 2
menjadi
4x+5y=54.900
4x+6y=61.400
_
----------------------
-1y= -6.500
y = -6.500 : -1
y = 6.500
2x+3y=30.700
2x+ 3(6.500)= 30.700
2x+19.500= 30.700
2x=30.700-19.500
2x= 11.200
x= 11200 : 2
x = 5.600
ditanya 1 sendok+1garpu
1x+1y=?
1(5.600)+ 1(6.500)=
5600+6500= 12.100
4x + 5y = 54900 | 2 | 8x + 10y =109800
2x + 3y = 30700 | 4 | 8x + 12y =122800 -
kita cri (y) dulu---> -2y =-13000
y =6500
4x + 5y = 54900
4x + 5(6500) = 54900
4x = 54900 -32500
4x =22400
x = 22400 : 4 => x = 5600
Jadi harga 1sendok + 1garpu = 5600 + 6500 =Rp.12100