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(2,-1), m=-3 point-slope form

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y=mx+b\\\\m-\ slope\\\\ y=-3x+b\\\\substitute \ point\ (2,-1)\\\\ -1=-3*2+b\\\\ -1=-6+b\ \ \ | add\ 6\\\\ 5=b\\\\ \boxed{y=-3x+5}
User TwiN
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