Question

x_2y= -2y=-1; 2x-y=7​

Answer 1

Answer:

x-2y=1 (1)

2x-y=7 (2)

multiplicating eq (1) by two and substracting from eq (2)

2x-4y= -2

2x-y= 7

(+) (-)

the (-) is changed into (+) & the (+) ischanged into (-)

_____________

-3y = -9 the (-) were cut

[y=e]

then x = 2y-1 = (6-1) = 5

[x=5]