SAT Math Multiple Choice Practice Question 392: Answer and Explanation

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Question: 392

18. If and, what is the value of ?

A. 5
B. 8
C. 15
D. 17
E. 19

Correct Answer: E


E Always read the problem carefully and notice what it's asking for. Don't assume that you must solve for x and y here. Finding the value of is much simpler than solving the entire system:

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