Question

3x-9x=6 5x-15x=10-2x+6y=-4

Answer 1

3x-9x=6
-6x=6
-x=6/6
- x= 1 (vamos inverter todos os sinais)
x = -1

5x-15x=10
-10x=10
-x=10/10
- x=1
x= -1

-2x+6x=-4
4x = -4
x= -4/4
x= -1