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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is 1/-4 is equal to -4?
please answer this...... I need help with linear equations and ratio, and i dont understand any of it u put a linear equation and u see a bunch of numbers letters and brackets which is all a big blur to me