Question

represente geometricamente os sistemas lineares a) {x+y=7 ,3x-y=5 , b) {3x+6y=9,5x-15= -10y por favor ajudeme

Answer 1

a)

{x+y=7
{3x-y=5
:
:
4x=12
x=12/4
x=3

x+y=7
3+y=7
y=7-3
y=4

v= { ( 3 , 4 ) }






b)

{3x+6y=9
{5x-15= -10y
:
:
{x=3-2y
{5x-15= -10y
:
:
5 (3 - 2y ) -15 = - 10y

( x , y )= ( 3 - 2y , y )