exam Maths Puzzle Numerical Ability

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Problem #10
Solve the system by addition. Be sure to state the solution.

5x - 7y = 5
x + 3y = 1

Problem #11
Slove the system by graphing. Be sure to state the solution.
2x - 2y = 10
x + y = 3
x = 4

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exam Other Question

Two children are trying to cross a stream. They want to use a log that goes from one bank to the other. If the left bank is 9 feet higher than the right bank and the stream is 12 feet wide, how long must a log be to just barely reach?
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