Explicație pas cu pas:
7. x+y=44 => x=44-y
x/y=3/8 => (44-y)/y=3/8
8(44-y)=3y
352-8y=3y
352=8y+3y
352=11y
y=352÷11
y=32
x=44-y=44-32=12
8. x-y=36 => x=y+36
x/y=5/7 => (y+36)/y=5/7
7(y+36)=5y
7y+252=5y
7y-5y=252
2y=252
y=252÷2
y=126
x=y+36=126+36=162
