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Lelechka [254]
3 years ago
15

5x + 7y = 2 and -2x + 7y = 9

Mathematics
1 answer:
elixir [45]3 years ago
6 0

Answer:

conclusion one solution (-1 , 1)

Step-by-step explanation:

hello :

5x + 7y = 2 ...(*)

-2x + 7y = 9....(**)

by(*) and (**) calculate 7y

7y = 2-5x

7y = 9+2x

9+2x = 2-5x

2x+5x = 2-9

7x=-7   so : x= - 1

put this value in expression : 7y = 9+2x

7y = 9+2(-1)

7y =7

y =1

conclusion one solution (-1 , 1)

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