book Maths Puzzle Numerical Ability

This question is actually about elimination because there werent any catorgories for elimination. My question is:
0.5x+0.5y=-2
x-0.25y=6

My answer was (2.5,-14) but I don't th

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book Other Question
when x^3 + 3x^2 - 2x + 7 is divided by x + 1, the remainder is
a. 7
b. 8
c. 9
d. 11
e. 13 I am not certain of the steps for this;
ar^2 - brs + ars - br^2 = ar^2 + ars - brs - br^2

Thanks,
ttsj