Question

1- resolva os sistemas:

a)2× - 8y = 32
× + 3y = 2

b) 3× - 15y = 18
6× - 10y = 36

c) 6× + y = 37
× + 3y = 9

d) 2× + 4y = 6
×- 2y = 3

e) × + y = 2
6 × + 2y = 10
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Answer 1

Resposta:

a) x + 3y = 2 .(-2)

2x - 8y = 32

-14y = 28

y = -2

x + 3.(-2) = 2

x - 6 = 2

x = 8

c) 6× + y = 37 .(-3)

× + 3y = 9

-17x = - 102

x = 6

x + 3y = 9

6 + 3y = 9

3y = 9 - 6

y = 1

e) × + y = 2 .(-2)

6× + 2y = 10

4x = 6

x = 1,5

x + y = 2

1,5 + y = 2

y = 2 - 1,5

y = 0,5

b) 3× - 15y = 18 .(-2)

6× - 10y = 36

30y = 0

y = 30

6x - 10y = 36

6x - 10.30 = 36

6x = 36 - 300

6x = - 264

x = - 44