Question

resolva o sistema com 2 incognitas 
A) X-Y=3
     X+2Y=10

b) X=3Y
X+2Y=10

Answer 1

a)
x-y=3
x=3y
3y+2y=10
5y=10
y=10/5
y=2
x=3.2=6
s=(6,2)

b)
x=3y
3y+2y=10
5y=10
y=10/5
y=2
x=3.2=6
s=(6,2)