IrkaShevko

Verified answer

2.7
1) A∩B = {x| x∈N, 11< x < 19} = {12; 13; 14; 15; 16; 17; 18}
2) A∩B = {x| x = 12n, n∈N}
3) A∩B = {(x,y)| 2x - y = 1, x + y = 5} = {(2;3)}