book Maths Puzzle Numerical Ability

This question is on elimination...and it is also my last question... i just wanted you to check my answers to make sure that they were right.
-1/3x-4/3y=-2
1/3x-2/3y=4

My answer was (4,-4) Is this right?
thank you so so much!~

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Can someone help me with this problem?


Fir the circumference of a circle. The radius is 12 ft. Use 3.14 for pi and round the answer to one decimal place.
Thank you,
Sher
Using the Distributive property what would .... 2(4+t) be?