Question

am o problema din sisteme:x-2y=1
2x-y=7
rapid

Answer 1

x-2y=1 => 2x-4y=2

2x-y=7

-----------------------------(-)

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

-4y+y=-5

-3y=-5

$y = \frac{ - 5}{ - 3} = \frac{5}{3}$

2x-y=7

$2x - \frac{5}{3} = 7$

6x-5=21

6x=26

$x = \frac{26}{6} = \frac{13}{3}$

Answer 2

Răspuns:

2x+2y=7-1

2x+2y=6

2x=6-2y

2x=4

X=4+2

X=6

6x+2=y

Y=6-2

Y=4