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

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)