Which statements below are true? Select all that apply. A. If p → q and q are true, then p is true.
B. If p → q and p are true, then q is true.
C. If p → q and q → r are true, then p → r is true.
D. If p → q and r are true, then q → r is true.

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.

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