Question

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

Answer 1

`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}`