The sum of two positive integers, a and b, is at least 30. The difference of the two integers is at least 10. If b is the greater
integer, which system of inequalities could represent the values of a and b?
a + b 2 30 b2 a + 10
a + b 2 30 b sa - 10
a + b 530b2a + 10
a+b = 30 bsa - 10