When you have exponents with the same base and you divide them, you subtract the exponents.
![](https://i0.wp.com/66.media.tumblr.com/3643b1c849505736802c38f48ba134b6/tumblr_inline_phht1saiSf1qio24w_540.png?w=852&ssl=1)
So from what we’re given, we know that 2x – (x – y) = 1. We can solve that for y.
2x – (x – y) = 1
2x – x + y = 1
x + y = 1
y = 1 – x
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