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harga tipe x = x
harga stabillo = y
maka :
x = 5000 + y
4y + 3x = 57.000
subtitusi nilai x :
4y + 3x = 57.000
4y + 3 (5000+y) = 57.000
4y + 15.000 + 3y = 57.000
7y = 57.000 - 15.000
y = 42.000 / 7
y = Rp 6.000
jadi harga 1 tipex = 5000 + 6000 = 11.000
hrga 2 tipe x = 11.000 x 2 = 22.000