Question

equacoes de 1 grau


X+3=5
2X-Y=3


3X-2Y=4
4X-Y=9

Answer 1

A)x=2
   2x-y=3

  2x2-y=3

  y=1

  (x,y)=(2,1)

 B)
3x-2y=4
y=-9+4x

3x-2(-9+4x)=4

x=14/5

y=-9+4x14/5

y=11/5

(x,y)=(14/5,11/5)