Question

a)x + 3y = 6
2x + y = -3

b)4× - 2y=8
-×+y=6

c)× - y=12
4×+y=3

d)2× -4y=5
3× + 2y=8

e)2× - 4y=8
× + 8y=4​

Answer 1

Explicação passo a passo:

a)

x + 3y = 6

2x + y = -3

2x + 6y = 12

6y - y = 12 + 3 = 15

5y = 15

y = 3

x + 3*3 = 6

x = 6 - 9 = -3

S = (-3, 3)

b)

4x - 2y = 8

-x + y = 6

-4x + 4y = 24

2y = 32

y = 16

-x + 16 = 6

x = 10

S = (10, 16)

c)

x - y = 12

4x + y = 3

5x = 15

x = 3

3 - y = 12

y = -9

S = (3, -9)

d)

2x - 4y = 5

3x + 2y = 8

6x + 4y = 16

8x = 21

x = 21/8

21/4 - 4y = 20/4

4y = 1/4

y = 1/16

S = (21/8, 1/16)

e)

2x - 4y = 8

x + 8y = 4

x - 2y = 4

y = 0

x = 4

S = (4, 0)