Question

VALENDO 14 PONTOS !!!Resolva os sistemas.
A) {x+2y= 1
x+3y=0

B) {3X-2Y=1
5X+3Y=8

C) {X+Y=10
X-Y=2

Answer 1

A)

x+2y= 1

x+3y=0

x = - 3y

x + 2y = 1

- 3y + 2y = 1

- y= 1 .(-1)

Y = - 1

x = - 3y

x = -3.(-1)

x = 3

B)

{3X-2Y=1 (3)

5X+3Y=8 (2)

9x - 6y = 3

10x + 6y = 16 (+)

---------------------

19x = 19

x = 19/19

x = 1

3x - 2y = 1

3.1 - 2y = 1

3 - 2y = 1

3 - 1 = 2y

2 = 2y

2y = 2

y = 2/2

y = 1

C)

X+Y=10

X-Y=2 (+)

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2x = 12

x = 12/2

x = 6

x + y = 10

6 + y = 10

y = 10-6

y = 4