Add or subtract. use the least common multiple as the denominator.
4/15 + ⅚
5/12 - 3/20
⅗ + 3/20
⅝ - 5/24
3 5/12 + 1 ⅜
2 9/10 - 1 7/18

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So the first thing we do is to multiply the top equation by 3. the reason i want to do this is i notice there will be a 6y on both equations and can possibly add/subtract them. so we get 6y = -3x + 27. adding that and the second equation we get 6x = 27-15 which is 12. divide by 6 and we get 2. ∴ x = 2. substituting 2 into the first equation we get 2y = -2 + 9 which is 7. divide by 2 and we get 7/2. ∴ y = 7/2, x = 2.