[tex]\huge{\boxed{y-3=m(x+8)}}[/tex]
Point-slope form is [tex]y-y_1=m(x-x_1)[/tex], where [tex]m[/tex] is the slope and [tex](x_1, y_1)[/tex] is a point on the line.
Substitute in the values. [tex]y-3=m(x-(-8))[/tex]
Simplify the negative subtraction to become positive addition. [tex]\boxed{y-3=m(x+8)}[/tex]
Note: This answer is in point-slope form. If this is not an answer choice, or if you prefer a different form for another reason, please let me know in a comment and I will be happy to provide another form of the equation.