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Alecsey [184]
3 years ago
7

I don’t understand the concept of this problem

Mathematics
1 answer:
maxonik [38]3 years ago
5 0

Answer:

This uses the method of elimination/addition.

Step-by-step explanation:

1 (9x + 7y = 15)

-7 (5x + y = -9) <— let’s eliminate y for both equations

9x + 7y = 15

+ -35x - 7y = 63 <— add both of the equations

—————————————————

- 26x + 0y = 6

(Please let me know if the answer is correct or not)

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Alvin's age is two times Elga's age. The sum of their ages is 63. What is Elga's age?
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