Question

encontre x e y que determina,em cada caso, a igualdade a (x,y)=(2,-5) b (x+4,y-1)=(5,3) c (x+y,x-3y)=(3,7)

Answer 1

a) x=2 y=-5
b) x+4=5 x=5-4 x=1
y-1=3 y=3+1 y=4
c) x+y=3 x=3-y
x-3y=7 3-y-3y=7 -4y=7-3 -4y=4 *(-1) 4y=-4 y=-4/4 y=-1
Logo x=3-y x=3-(-1) x=3+1 x=4