harga 3 kg beras dan 2 kg gula pasir adalah 72.000 sedangkan harga 10 kg beras dan 6 kg gula pasir adalah 230.000. Tentukanlah harga 1kg beras dan 1kg gula pasir dengan metode grafik

<p>ok Graceia saya bantu jawab...</p><p>Misalkan :</p><ul><li>x = beras</li><li>y = gula pasir</li></ul><p>maka kalimat matematikanya menjadi</p><p>3x + 2y = 72.000 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;(1)</p><p>10x + 6y = 230.000 &nbsp; &nbsp; &nbsp; &nbsp; (2)</p><p>&nbsp;</p><ul><li>Eliminasi y untuk mendapatkan nilai x</li></ul><p>&nbsp; &nbsp; &nbsp; &nbsp;3x + 2y = 72.000 &nbsp;--&gt; (dikali 3) &nbsp; 9x + 6y = 216.000</p><p>&nbsp; &nbsp; &nbsp; &nbsp;10x + 6y = 230.000 &nbsp;--&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;<u> 10x + 6y = 230.000</u> -</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;-x &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = - 14.000</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;x = 14.000</p><p>&nbsp; &nbsp; &nbsp; &nbsp; Harga 1 kg beras adalah <strong>Rp. 14.000</strong></p><p>&nbsp;</p><ul><li>Substitusikan x = 14.000 ke persamaan (1) untuk mencari nilai y</li></ul><p>&nbsp; &nbsp; &nbsp; &nbsp;3x + 2y = 72.000</p><p>&nbsp; &nbsp; &nbsp; &nbsp; 3(14.000) + 2y = 72.000</p><p>&nbsp; &nbsp; &nbsp; &nbsp; 42.000 + 2y = 72.000</p><p>&nbsp; &nbsp; &nbsp; &nbsp; 2y = 72.000 - 42.000</p><p>&nbsp; &nbsp; &nbsp; &nbsp; 2y = 30.000</p><p>&nbsp; &nbsp; &nbsp; &nbsp; y = 30.000 : 2</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;y = 15.000</p><p>&nbsp; &nbsp; &nbsp; &nbsp; Harga 1 kg gula pasir adalah <strong>Rp. 15.000</strong></p><p>&nbsp;</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Jadi, Harga 1 kg beras adalah <strong>Rp. 14.000 </strong>dan harga1 kg gula pasir&nbsp;</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; adalah <strong>Rp. 15.000</strong></p>