Question

resolva esses sistemas de equações para mim:

a) {x-3y=-3
{x-y=1

b) {x-2y=3
{2x+y=11

Answer 1

Bom dia
a) x-3y= -3
x-y=1x(-3)
------------
x-3y= -3
-3x+3y=-3
----------
-2x= -6
x=-6/-2= 3
--------------------
x-y= 1
3-y=1
-y= 1-3
-y= -2x(-1)
y=2

b) x-2y= 3x(-2)
2x+y= 11
------------
-2x+4y= -6
2x+y= 11
-----------
5y= 5
y= 5/5= 1
-----------------
2x+1=11
2x=11-1
2x=10
x= 10/2
x= 5