Respuesta :

you need to find the slope by using 2 points   (0,3)  (-3,0)

m= (y2-y1)/(x2-x1) = (-3)/(-3)=1

equation of the line in point slope form

y-y1 = m (x-x1)

y-0 = 1 (x- -3)

y = x+3