Answer:
D is correct.
Step-by-step explanation:
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13x = 39 can replace 3x + 5y = 59 in the original system and still produce the same solution.
Work:
1) 11y - 3 = 13x
2) 11y = 13x + 3
3) y = 13/11x + 3/11
Answer:

Step-by-step explanation:
this is the equation used to find the average of two numbers.