Question

10.- Realiza la comprobación de las dos ecuaciones y señala si son equivalentes. *
2x + y = 7
x-2y = 1​

Answer 1

Holà

2x + y = 7

x - 2y = 1

2x = 7-y

x - 2y = 1

x = (7-y)/2

x-2y = 1

(7-y)/2 - 2y = 1

1/2(7-y-4y) = 1

1/2 ( 7 -5y ) = 1

7-5y = 2

-5y = -7+2

-5y = -5

y = -5/-5

y = 1

x = (7-y)/2

x = (7-1)/2

x = 6/2

x = 2

(x;y) = (2;1)