Question

resolva os sistemas a seguir

Answer 1

A){x+2y=14
{3x+y-x=13

{x+2y=14
{2x+y=13

{-2x-4y = -28
{2x+y=13

-3y=-15

y=5

2x+5=13

x=4

(x,y)=(4;5)

{4/2+5=7
{3.4+5=4+13

{7=7
{17=17
(x;7). = (4;5)


B){x+2y-2x-3y=0
{3x-5y=16

{-x-y=0
{3x-5y=16

-8y=16
y=-2
-x-(-2)=0
x=2
(x;y) =(2,-2)

{2+2.(-2)=2.2+3.(-2)
{3.2-5.(-2)=16

{-2=-2
{16=16

(x;y) = (2;-2)


C)3y/2-5y =42
3y -10y=84
-7y=84
y=-12
3x-5.(-12)=42
x=-6
(x;y)=(-6;-12)

{-6=-12/2
{3.(-6)-5.(-12)=42

{-6=-6
{42=42

(x;y)= (-6;-12)