Question

...Urgente!!! preciso pra hoje ainda por favor

FORME CONTA

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Answer 1

a) {x - y = 5

{x + y = 7

2x = 12

x = 12

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2

x = 6

x + y = 7

6 + y = 7

y = 7 - 6

y = 1

S = {(6 , 1)}

b) {x + 2y = 7

{x - 2y = - 5

2x = 2

x = 2

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2

x = 1

x + 2y = 7

1 + 2y = 7

2y = 7 - 1

2y = 6

y = 6

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2

y = 3

S = {(1 , 3)}