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Korvikt [17]
3 years ago
11

​ y=−8x−3 x+y=7 ​ Is (3,4)(3,4)left parenthesis, 3, comma, 4, right parenthesis a solution of the system? Choose 1 answer: Choos

e 1 answer: (Choice A) A Yes (Choice B) B No
Mathematics
2 answers:
kirill [66]3 years ago
7 0

Given:

The system of equation is

y=-8x-3

x+y=7

To find:

Whether (3,4) is a solution of the given system or not.

Solution:

We have,

y=-8x-3          ...(i)

x+y=7            ...(ii)

Putting the value of y in (ii) from (i), we get

x+(-8x-3)=7

x-8x-3=7

-7x=7+3

-7x=10

Divide both sides by -7.

x=\dfrac{10}{-7}

x=-\dfrac{10}{7}

Putting x=-\dfrac{10}{7} in (i), we get

y=-8\times (\dfrac{-10}{7})-3

y=\dfrac{80}{7}-3

y=\dfrac{80-21}{7}

y=\dfrac{59}{7}

So, the only solution of the given system is \left(-\dfrac{10}{7},\dfrac{59}{7}\right).

Hence, (3,4) cannot be a solution of given system, Hence the correct option is B.

aalyn [17]3 years ago
6 0

Answer: B I got it right in khan academy

Step-by-step explanation:

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