Question

Resolva os sistemas abaixo :

A)
X=2y

X+y=12

B)
y = 3x
X -y =-6

C)

X+y =5
X+3y=11

Answer 1

a)2y+y=12
3y=12
y=4

x=2.4
x=8

b)x-3x=-6
-2x=-6
2x=6
x=3

y=3.3
y=9

c)x=5-y

5-y+3y=11
5+2y=11
2y=6
y=3

x=5-3
x=2