exam Maths Puzzle Numerical Ability

Please solve and graph for me please
3x -6y =9
x -2y =3

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exam Other Question

Jack and Jill can wash a carpet together in 1 hour and 30 minutes. Washing alone, it takes Jill 2 hours and 10 minutes to get the carpet clean. How long does it take Jack to wash the carpet by himself? For any chi-square goodness-of-fit problem, the number of degrees of freedom is found by
A) n � k � 1.
B) k � 1.
C) n + 1.
D) n + k.
E) none of the above.