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KaylaneMartins
@KaylaneMartins
January 2020
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Se (x, y) é a solução de:
{x+2y=5
{4x-y=2
Então o valor de x+y é:
a) 1
b) 2
c) 3
d) 4
Com conta, por favor =)
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iarafortunato
{ x +2y=5
{ 4x - y = 2
{x= -2y + 5
{4x - y = 2
{--------
{ 4* (-2y + 5) -y =2
{--------
{ -8y + 20 - y = 2
{--------
{-9y = 2 -20
{--------
{ y = -18/-9
{--------
{ y = 2
{ x = -2 *2 +5
{ y=2
{x= -4 +5
{y=2
{x=1
{y=2
x+y = 1+2 = 3 (c)
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{ 4x - y = 2
{x= -2y + 5
{4x - y = 2
{--------
{ 4* (-2y + 5) -y =2
{--------
{ -8y + 20 - y = 2
{--------
{-9y = 2 -20
{--------
{ y = -18/-9
{--------
{ y = 2
{ x = -2 *2 +5
{ y=2
{x= -4 +5
{y=2
{x=1
{y=2
x+y = 1+2 = 3 (c)