On my paper, I have now the two equations:

These are two equations, and in each of them I have the unknowns a and b. The problem is to find out what is a and what is b.

What you need to do: you must eliminate one of the two. In other works: You must do something to your equations such that you end up only with one equation, but also only with one unknown. Once you have that, it's easy to solve.

Here, the unknown that begs you to be eliminated, is a.

(If you want, you can also eliminate b, but it's more work.)

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