Question

b) 7x - 2y = 5
14 х - 4y = 1​

Answer 1

Explicação passo-a-passo:

7x - 2y = 5. - 2y = 5 - 7x

14x - 4y =1

14x - 4(5 - 7x)= 1

14 x - 20 +28x = 1

14x + 28x = 1 + 20

42x = 21

X= 21 / 42 =1/2

-2y = 5 - 7. 1/2

-2y = 5 - 7/2

-4y = 10 - 7/

-4y= 3

Y= 3/-4