Question

Harga 4 sendok dan 5 garpu adalah Rp.54,900,00 sedangkan harga 2 sendok dan 3 garpu Rp.30.700,00 harga 1 sendok dan 1 garpu adalah...

Answer 1

S = sendok
g = garpu

4s + 5g = 54.900  | x1 |    4s + 5g = 54.900
2s + 3g = 30.700   | x2 |   4s + 6g = 61.400  -
                                             -g  = -6500
                                               9 = -6500/-1 = 6500
2s + 3g = 30.700
2s + 3(6500) = 30700
2s + 19500 = 30700
s = (30700 - 19500) : 2 = 5600

Jadi,,
s + g = 5600 + 6500 
         = 12.100

maaf kalo salah...

Answer 2

4x+5y=54,900(x1) --> 4x+5y=54,900     
2x+3y=30,700(x2) --> 4x+6y=61,400

-y=-6500 --> y=6500

2x+3(6500)=30,700     2x=30,700-19,500    x=5600
2x+19,500=30,700      2x=11,200
 
x+y=5600+6500=Rp.12,100,00