Question

Determine a solução

D) {x-y=6
{X+y=-7

E) {x=5-3y
{2x-y=-4

F) {y=4-2x
{5x-2y=1

G){2x-y=1
{4x-3y=1

H){x-3=-y
{3x+2=+3

Answer 1

Boa tarde

D)
 
{x - y =6
{x + y =-7

2x = -1
x = -1/2 
y = x - 6 = -13/2 

E)

{x = 5 - 3y
{2x - y = -4

10 - 7y = -4
7y = 14
y = 2
x = 5 - 6 = -1

F)

{y=4-2x,
{5x-2y=1

5x - 8 + 4x = 1
x = 1
y = 4 - 2 = 2 

G){2x-y=1
{4x-3y=1

H)

{x-3=-y
{3x+2=+3

3x = 1
x = 1/3
y = -x + 3 = 9/3 - 1/3 = 8/3