book Maths Puzzle Numerical Ability

2 problems I am totally lost on, please help!!

the linear system of equations has the unique solution(10,-12)(there are many correct answers)

the linear system of equations h

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book Other Question
what is the translation for temperature in degrees fahrenheit F is the same as ninth-fifths of the deegrees celsius C pluse thirty-two 23.5-5.2-(-1.3)