Marsandra membeli 3 buku tulis dan 2 bolpoin seharga Rp16.000,00. Fairuz membeli 5 buku dan 1 bolpoin yang sama seharga Rp22.000,00. Tentukan: a. model matematika dari soal tersebut, b. harga sebuah buku tulis, C. harga sebuah bolpoin, setta d. harga 2 buah buku dan 1 buah bolpoin! Jawab yang bener ya

<p>Misalkan : buku tulis = x</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; bulpoin = &nbsp;y</p><p>diketahui : marsandra : 3 buku tulis + 2 bulpoin seharga Rp 16.000</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<strong>3x + 2y = Rp 16.000 &nbsp;---&gt; pers 1</strong></p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;fairuz &nbsp;: 5 buku tulis + 1 bulpoin seharga Rp 22.000</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<strong>5x + y = Rp 22.000 &nbsp; ---&gt; pers 2</strong></p><p>a. model matematika&nbsp;</p><p>&nbsp; &nbsp; &nbsp;<strong>3x + 2y = Rp 16.000 &nbsp;---&gt; pers 1</strong></p><p><strong>&nbsp; &nbsp; &nbsp;5x + y = Rp 22.000 &nbsp; ---&gt; pers 2</strong></p><p>b. harga sebuah buku tulis&nbsp;</p><p>&nbsp; &nbsp; 3x + 2y = Rp 16.000 &nbsp; |x1| &nbsp; &nbsp;3x + 2y = Rp 16.000</p><p>&nbsp; &nbsp;&nbsp;<u> 5x + y &nbsp;= Rp 22.000&nbsp;</u> &nbsp; |x2| <u>10x + 2y = Rp 44.000&nbsp;</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; - 7x &nbsp; &nbsp; &nbsp; &nbsp;= Rp -28.000</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;x &nbsp; &nbsp; &nbsp; &nbsp;= Rp -28.000 : (-7)</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;<strong> x &nbsp; &nbsp; &nbsp; &nbsp;= Rp 4.000</strong></p><p>&nbsp; &nbsp;<strong> &nbsp; Maka harga sebuah buku tulis adalah Rp 4.000</strong></p><p>c. harga sebuah bulpoin&nbsp;</p><p>&nbsp; &nbsp; &nbsp;5x + y = Rp 22.000</p><p>&nbsp; &nbsp; &nbsp;5 ( Rp 4000) + y = Rp 22.000</p><p>&nbsp; &nbsp; &nbsp; Rp 20.000 + &nbsp; y &nbsp;= Rp 22.000</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; y &nbsp; = Rp 22.000 - Rp 20.000</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;<strong>y = Rp 2.000</strong></p><p>&nbsp; &nbsp; &nbsp;<strong>Maka harga sebuah bulpoin adalah Rp 2.000</strong></p><p>d. &nbsp;harga dua buah buku tulis dan 1 buah bulpoin&nbsp;</p><p>&nbsp; &nbsp; &nbsp; 2x + y&nbsp;</p><p>&nbsp; &nbsp; &nbsp;= 2 (Rp 4.000) + Rp 2.000</p><p>&nbsp; &nbsp; &nbsp;= Rp 8.000 + Rp 2.000</p><p>&nbsp; &nbsp; &nbsp;= Rp 10.000</p><p>&nbsp; &nbsp; &nbsp;&nbsp;<strong>Maka harga dua buku tulis dan 1 buah bulpoin adalah Rp 10.000</strong></p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;<br>&nbsp;</p><p>&nbsp;</p>