exam Maths Puzzle Numerical Ability

Solve the system by addition.
2x + 4y = -9
4x - 2y = -3

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exam Other Question

You are in a cave with 5 green- or blue-eyed people who can see in the dark. Green-eyed people always tell the truth; blue-eyed people always lie. A says: "I see three pairs of gre shelby walked for awhile at 4 mph and then jogged the rest of the way at 8 mph. If she covered 56 miles in 10 hours how far did she walk, and how far did she jog?..any help would be GREAT! : )