Question

I need help on this math problem

Answer 1

The answer is: x=28/9, y=20/9

Answer 2

(1/7)x + (1/4)y = 1

(1/2)x - (1/4)y = 1

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(9/14)x = 2

x = 28/9, y = 4(1 - (1/7)(28/9))

= 4(1 - (4/9))

= 4(5/9)

= 20/9