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<svg width="700" height="300" xmlns="http://www.w3.org/2000/svg">
<text x="350" y="22" fill="#333" font-size="14" font-weight="bold" text-anchor="middle">Linear Regression: Best-Fit Line and Residuals</text>
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<line x1="60" y1="250" x2="60" y2="40" stroke="#333" stroke-width="1.5"/>
<text x="350" y="275" fill="#666" font-size="11" text-anchor="middle">x</text>
<text x="35" y="145" fill="#666" font-size="11" text-anchor="middle" transform="rotate(-90,35,145)">y</text>
<!-- Best-fit line -->
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<text x="600" y="55" fill="#3498db" font-size="11" font-weight="bold">y = wx + b</text>
<!-- Data points and residual lines -->
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<circle cx="220" cy="195" r="4.5" fill="#e74c3c" opacity="0.8"/>
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<circle cx="320" cy="170" r="4.5" fill="#e74c3c" opacity="0.8"/>
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<circle cx="370" cy="120" r="4.5" fill="#e74c3c" opacity="0.8"/>
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<circle cx="420" cy="135" r="4.5" fill="#e74c3c" opacity="0.8"/>
<line x1="420" y1="135" x2="420" y2="124" stroke="#9b59b6" stroke-width="1.2" stroke-dasharray="3,2"/>
<circle cx="470" cy="85" r="4.5" fill="#e74c3c" opacity="0.8"/>
<line x1="470" y1="85" x2="470" y2="110" stroke="#9b59b6" stroke-width="1.2" stroke-dasharray="3,2"/>
<circle cx="520" cy="105" r="4.5" fill="#e74c3c" opacity="0.8"/>
<line x1="520" y1="105" x2="520" y2="95" stroke="#9b59b6" stroke-width="1.2" stroke-dasharray="3,2"/>
<circle cx="570" cy="70" r="4.5" fill="#e74c3c" opacity="0.8"/>
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<!-- Legend -->
<circle cx="180" cy="292" r="4" fill="#e74c3c"/>
<text x="195" y="296" fill="#666" font-size="10">data points</text>
<line x1="270" y1="292" x2="290" y2="292" stroke="#3498db" stroke-width="2"/>
<text x="300" y="296" fill="#666" font-size="10">best-fit line</text>
<line x1="390" y1="292" x2="410" y2="292" stroke="#9b59b6" stroke-width="1.2" stroke-dasharray="3,2"/>
<text x="420" y="296" fill="#666" font-size="10">residuals (errors)</text>
</svg>
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