Question

X+Y=3
X-Y=9
Com os calculos

Answer 1

X+Y= 3
X-Y= 9

X= 3-Y

X-Y= 9, logo, 3-Y-Y= 9 --> -Y-Y= 9-3 --> -2Y= 6 --> -Y= 6÷2 --> -Y= 3 ×(-1) --> Y= -3

X= 3-Y, logo, X= 3-(-3) --> X= 3+3 --> X= 6

X= 6
Y= -3