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<div align="center"><br /> <table style="color: #003300; border: 4px solid #003300; float: none; text-align: left; vertical-align: top; width: 400px; background-image: none; background-color: #ffffcc;" border="4" frame="void" rules="none"> <tbody> <tr> <td style="background-color: #003300; background-image: none; color: #ffcc00; border-color: #000066; text-align: center; vertical-align: top; border-style: none;" valign="top" width="NaNpx"><span style="font-size: large; color: #ffff99;" data-mce-mark="1">Substitució</span><strong><br /></strong></td> </tr> <tr> <td valign="top" width="NaNpx"> <p><span style="color: #003300; font-size: small;"><strong>Si un dels coeficients és 1: «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mfenced mathcolor=¨#003300¨ open=¨{¨ close=¨}¨»«mtable»«mtr»«mtd»«mi mathvariant=¨bold¨»x«/mi»«mo mathvariant=¨bold¨»-«/mo»«mn mathvariant=¨bold¨»5«/mn»«mi mathvariant=¨bold¨»y«/mi»«mo mathvariant=¨bold¨»=«/mo»«mn mathvariant=¨bold¨»9«/mn»«mo mathvariant=¨bold¨»§#160;«/mo»«mo mathvariant=¨bold¨»§#160;«/mo»«mo mathvariant=¨bold¨»§#160;«/mo»«mo mathvariant=¨bold¨»§#160;«/mo»«mo mathvariant=¨bold¨»§#160;«/mo»«/mtd»«/mtr»«mtr»«mtd»«mn mathvariant=¨bold¨»3«/mn»«mi mathvariant=¨bold¨»x«/mi»«mo mathvariant=¨bold¨»+«/mo»«mn mathvariant=¨bold¨»2«/mn»«mi mathvariant=¨bold¨»y«/mi»«mo mathvariant=¨bold¨»=«/mo»«mo mathvariant=¨bold¨»-«/mo»«mn mathvariant=¨bold¨»7«/mn»«/mtd»«/mtr»«/mtable»«/mfenced»«/mstyle»«/math»<br />aïllem x en la primera equació: x = <span style="color: #ff0000;">5y + 9</span><br />el substituïm en la segona: 3(<span style="color: #ff0000;">5y+9</span>) + 2y = -7<br />resolem: 17y + 27 = - 7 <=> y = -2<br />i substituint y per -2 en qualsevol de les dues: x = -1.<br /></strong></span></p> <p><span style="color: #003300; font-size: small;"><strong>Solució: (-1,-2)</strong></span></p> </td> </tr> </tbody> </table> </div>
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