Answer:
a) 7/-9 and - 7/9 (the second and fourth one)
b) -4/-3 (the first one)
Explanation:
Read below
a)
b) (The reason both numerator and denominator can both be negative is because the negative cancel each other out and still simplify to )
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(The reason both numerator and denominator can both be negative is because the negative cancel each other out and still simplify to 
)