exam Maths Puzzle Numerical Ability

How can I solve 3a + 5b = 31
7a + 5b = 59

Using elimination? (or linear combination method)

Thanks!

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exam Other Question

Find the values of x and y in the parallelogram.

one side is 10. one side is x, one side is 12, one side is 3y + 1 and it looks like a square?? i hope this helps Word Problem:
The use of toll-free numbers has grown exponentially. In 1967, there were 7 million calls to toll-free numbers, and in 1991, there were 10.2 billion such calls (Sou