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y = sebuah kursi
maka persamaan linear 2 variabelnya adalah
x + 4y = 500.000 ...........(1) persamaan 1
2x + 3y = 350.000 ........ (2) persamaan 2
x + 4y = 500.000 l x2 l
2x + 3y = 350.000 l x1 l
............................................
2x + 8y = 1.000.000
2x + 3y = 350.000
...................................... -
5x = 650.000
x = 650.000/5
x = 130.000
substitusikan ke persamaan 2
2x + 3y = 350.000
2(130.000) + 3y = 350.000
260.000 + 3y = 350.000
3y = 350.000 - 260.000
3y = 90.000
y = 90.000/3
y = 30.000
maka harga 1 meja dan 1 kursi
= x + y
= Rp 130.000 + Rp 30.000
= Rp 160.000
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