Well here are 3
(0,7);(1,11);(2,15)
4(0) + 7 y:7
You can keep doing it choose a number for x that's and for y multiply 4 times the numer you choosed for x and add 7 to it
I think in commutative properties of multiplication:
70 x 6000 = 70 x 6000
420,000 = 420,000
I don't know associative properties, only commutative properties. Sorry :(

No real solutions, because for all real numbers the square of number is greater or equal 0.