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penghapus: y
2x = 3y -> x=3/2y
4x + 4y = 10.000
substitusi
4x + 4y = 10.000
4(3/2y) + 4y = 10.000
6y + 4y = 10.000
10y = 10.000
y = 10.000/10
y = 1000
x= 3/2y
x= 3/2 x 1000
x= 1500
jd hrg 1 buku Rp 1500,-