exam Maths Puzzle Numerical Ability

If three times the first number plus four times the second number equals 26, and ten times the first number and minus two times the second number equals 10, what are the numbers?

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exam Other Question
Solve for "r"

C=2(Pi)r it is problem set 4.3 I cant seem to figure out these problems i need to see the steps worked out. Do I find the lcm or reduce ?