Question

{x-y=1
{x+y=9

{x+y=8
{x-y=2

{x+y=4
{2x-y=5

{y=4x
{x+y=5

sistemas de equações

Answer 1

A)
{x - y= 1
{x + y= 9

2x = 10
x = 10/2
x = 5

5 + y = 9
y = 9 - 5
y = 4

S= ( 5 , 4)

B)
{x + y= 8
{x - y= 2

2x = 10
x = 10/2
x = 5

5 + y = 8
y = 8 - 5
y = 3

S= ( 5 , 3)

C)
{x + y= 4
{2x - y= 5

3x = 9
x = 9/3
x = 3

3 + y = 4
y = 4 - 3
y = 1

S= ( 3 , 1)


D)
{y = 4x
{x + y= 5

x + 4x = 5
5x = 5
x = 5/5
x = 1

1 + y = 5
y = 5 - 1
y = 4

S= ( 1 , 4 )