sugakookies1
03.04.2020 •
Mathematics
A solution of a system of linear equations
x - y = 5
- 3 x + y = - 1
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Ответ:
one solution : (-2 ; -7)
Step-by-step explanation:
hello :
x - y = 5 (*)
- 3 x + y = - 1 (**)
by (*) : y=x-5
by(**) : y = 3x-1
3x-1 = x -5
3x-x=-5+1
2x= -4
x= -2
but : y = x-5 so : y= -2-5=-7
one solution : (-2 ; -7)
Ответ: