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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book Other Question

What is the equation of the line passing through the points
(-3,8) and (-4,-5)

A)y=13x-47
B)y=13x+47
C)y=13x-31
D)y=-13x-31

Please show me all your work so that I can learn how to do this..thanks
m(x)=3x