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**Jhevon** ok, so you realized that i subtracted equation 2 from 1, good. But why? Well, this is a standard method for solving simultaneous equations. solving an equation with one variable is easy, so our objective is to get one variable. so to acheive this, we try to get the coefficient of one of the two variables the same in both equations. Here, the coefficient of k was already the same in both equations, that is 1. Then subtracting the two equations allow me to get rid of k, since 1k - 1k = 0. that way i am left with a only, and solving the equation becomes easy.

after finding a, i can substitute its value into either equation to find k