Answer:

Explanation:
Given

Solving (a): The possible coordinates
We have:

This gives:



(-2,8) is a point on the grid

This gives:



(7,5) is a point on the grid

This gives:



(-5,5) is a not point on the grid

This gives:



(1,3) is a not point on the grid

This gives:



(1,7) is a point on the grid
So, we plot the following on the grid

See attachment