Respuesta :
Infinite solutions
Work:
Substitution method
x-2y=7
x=2y+7
-3(2y+7)+6y=-21
-6y-21+6y=-21
-21=-21
Work:
Substitution method
x-2y=7
x=2y+7
-3(2y+7)+6y=-21
-6y-21+6y=-21
-21=-21