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3 years ago

Pls help i dont know the answer to this

Mathematics

1 answer:

Dahasolnce [82]3 years ago

7 0

Answer:

4 1/12

Step-by-step explanation:

make all the denominators 12 so u can add them easier

2 1/12 + 2 4/12 + 3 2/12 = 7 7/12

nn subtract from the 11 2/3

11 8/12 - 7 7/12 = 4 1/12

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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

kirill [66]

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.

7 0

3 years ago

Read 2 more answers

Hi! Please help me!

ddd [48]

Answer:

The answer is t^-1 (r)=120r/120-r

i hope this is right sry if im wrong have a good day :)

3 0

2 years ago

I NEED HELP!!

musickatia [10]

Answer:

D 108

Step-by-step explanation:

YOU CAN MARK ME AS BRAINIEST IF YOU WANT

6 0

3 years ago

Six fewer than half a number is ten more than two and a half times the number. Define a variable, write an equation, and solve i

spayn [35]

Answer:

Define a Variable: x = the number

Equation: 1/2x - 6 = 2 1/2x + 10

Solve:

1/2x - 6 = 2 1/2x + 10

1/2x - 16 = 2 1/2x

-16 = 2x

x = -8

4 0

3 years ago

Help guys show your solution

Ivahew [28]

Answer:

Profit = $\frac{80p + 170}{p}$

Step-by-step explanation:

Cost of the Yield = $\frac{100p + 200}{p}$

Cost of the labour = $\frac{10p + 50}{p}$

Cost of the fertilisers = $\frac{10p - 20}{p}$

Total expenses = $\frac{10p + 50}{p} + \frac{10p - 20}{p} = \frac{20p + 30}{p}$

Profit = Total expenses - Cost of yield

$= > \frac{100p + 200}{p} - \frac{20p + 30}{p}$

$= > \frac{80p + 170}{p}$

3 0

3 years ago