Question

o {3x+y=10 {-2x-y=-5 pelo metodo de substituiçao ?

Answer 1

3x+y=10 --> y = 10-3x -2x-y=-5 -2x -y = -5 -2x -(10-3x)= -5 -2x -10 +3x = -5 -2x +3x = -5 +10 x = 5 -2x -y = -5 -2*5 -y = -5 -10 -y =-5 -y = -5 + 10 y = -5