For p = 1, q = 7
q can be rewritten as q=(4×1)+3=4p+3...(I)
For p = 2, q = 11
q can be rewritten as q=(4×2)+3=4p+3...(II)
For p = 3, q = 15
q can be rewritten as q=(4×3)+3=4p+3...(III)
For p = 4, q = 19
q can be rewritten as q=(4×4)+3=4p+3...(IV)
From equation (I), (II), (III) and (IV), we get q = 4p + 3