exam Maths Puzzle Numerical Ability

a.) Addition: 3x+7y=4
x-2y=-2

b.) Substitution: 5x-5y=-5
y=2x+0

c.) Add or Substitute: -4x-4y=-33
y=x+9

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exam Other Question

Solve for k: (2k-5)/-4 > 5

The answer given was (-theta, -15/2)

But, I think the answer should be (-15/2, theta)

How do I know for certain which side the theta is on? eric has 5 dog ands and 7 turtles. he is going to choose 4 dogs and 4 trtles to get groomed. how many ways is it possible to choose the 8 animals?