Respuesta :
It's (0,3)
y intercept means x =0
so when x = 0
7y+3x-21=0
7y+3(0)-21=0
7y -21 =0
7y = 21
y =21/7
y =3
y intercept means x =0
so when x = 0
7y+3x-21=0
7y+3(0)-21=0
7y -21 =0
7y = 21
y =21/7
y =3