Answer:
The value of x is 7 and y is 14.
Step-by-step explanation:
The steps are :
[tex] - 3x + y = - 7 - - - (1)[/tex]
[tex]y = x + 7 - - - (2)[/tex]
[tex](2)→(1)[/tex]
[tex] - 3x + (x + 7) = - 7 \\ - 3x + x + 7 = - 7 \\ - 2x = - 14 \\ x = 7[/tex]
[tex]substitute \: x = 7 \: \: into \: \: (2)[/tex]
[tex]y = 7 + 7 \\ y = 14[/tex]
