I need some help please!

p = 2i=j=2k and q=2i+2j

I am trying to find the equation of the plane OPQ, where O is the origin in R3.

Here is where I am

Let the equation of the plane be

ax + by + cz = d (S.1)

Substituing the coordinates of the three points in turn into the equation (S.1), we obtain

= d (S.2)

2a + b + 2c = d (S.3)

2a + 2b = d (S.4)