Question

y-x=20
$y - x = 20$
$2x - 15y = - 1$
​

Answer 1

Ответ:

y-x=20

2x-15y=-1

y=20+x

2x-15(20+x)=-1

y=20+x

2x-300-15x=-1

y=20+x

-13x=299

y=20+x

x=-23

y=20-23

x=-23

y=-3

x=-23

ответ:-23