7. Determine the truth value of each of these statements if the domain of each variable consists of all real numbers. a) xy(x2=y) b) xy(x=y2) c) xy(xy=0)d)xy(x+y!=y+x) e) x(x!=0y(xy=1)) f) xy(y!=0xy=1) g) xy(x+y=1) h) xy(x+2y=22x+4y=5) i) xy(x+y=22xy=1) j) xyz(z=(x+y)/2)