Question

A solution of a system of linear equations

x - y = 5
- 3 x + y = - 1

Answer 1

one solution : (-2 ; -7)

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)