Question

a) {x + y = 2
{x - y = - 6
b) {5x + y = 14
{x - 3y = 6​

Answer 1

Resposta:

a) {x + y = 2

   {x - y = - 6

+__________

    2x= -4

     x=-4/2

    x= -2

x + y = 2

-2 + y =2

y=2 +  2

y=4

S=(x,y) ⇒(-2,4)

b) {5x + y = 14

   {x - 3y = 6​

y= 14-5x

{x - 3y = 6​

x-3(14-5x)=6

x-42+15x=6

15x + x =42+6

16x=48

x=48/16

x=3

y= 14-5x

y=14-5.3

y=14-15

y=-1

S=(x,y) ⇒(3,-1)