Answer:
Step-by-step explanation:
Slope:
[tex]m=\dfrac{y_2-y_1}{x_2-x_1}=\dfrac{3-(-9)}{0-3}=\dfrac{12}{-3}=-4[/tex]
Point-slope frorm:
[tex]y-y_o=m(x-x_o)[/tex]
m = -4 ; point (0, 3) ⇒ x₀=0, y₀=3
y - 3 = - 4(x - 0)
y - 3 = - 4x
y = - 4x + 3 ← slope intercept form