book Maths Puzzle Numerical Ability

8b+2b-4=6

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book Other Question

The sum of Sally's age and the square of Melissa's age is 209. THe sum of Melissa's age and the square of Sally's age is 183. What is the sum of the ages? This question is actually about elimination because there werent any catorgories for elimination. My question is:
5x-4y=1
7x+4y=11

Thanks for the help!