Answer:
B
Step-by-step explanation:
Calculate the slope m using the slope formula
m = [tex]\frac{y_{2}-y_{1} }{x_{2}-x_{1} }[/tex]
with (x₁, y₁ ) = (1, 3) and (x₂, y₂ ) = (3, 9) ← 2 points on the line
m = [tex]\frac{9-3}{3-1}[/tex] = [tex]\frac{6}{2}[/tex] = 3 → B
