Question

me ajudem por favor

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

Answer 1

Vamos la

sistema

2x + y = 2

5x - y = 2

soma

7x = 4

x = 4/7

8/7 + y = 14/7

y = 14/7 - 8/7 = 6/7

Answer 2

{2x+y=2
{5x-y=2
:
:
{y= 2-2x
{5x-y=2
:
:
5x-(2-2x)=2
5x-2+2x=2
5x+2x=2+2
7x=4
x=4/7

2x+y=2
2*4/7+y=2
8/7+y=2
y=2 -8/7
y=6/7



S= { ( 4/7 ; 6/7 )}