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ivann1987 [24]
3 years ago
9

Help please must show work 5, 6, 7, 8 ,9

Mathematics
1 answer:
allsm [11]3 years ago
5 0

(5)

2r + s = 11 → (1)

r - s = 2 → (2)

add (1) and (2) term by term

3r = 13 ⇒ r = \frac{13}{3}

substitute this value into (2)

- s = \frac{6}{3} - \frac{13}{3} = - \frac{7}{3}

hence s = \frac{7}{3}

(6)

substitute y = 3 - x into the other equation

5x + 3(3 - x) = - 1

5x + 9 - 3x = - 1

2x + 9 = - 1 ( subtract 9 from both sides )

2x = - 10 ( divide both sides by 2 )

x = - 5

substitute x = - 5 into y = 3 - x

y = 3 - (- 5) = 3 + 5 = 8

(7)

add both equations to eliminate the term in b

22a = 0 ⇒ a = 0 and b = 0

(8)

Since both equations express y in terms of x , equate the right sides

3x - 1 = 2x - 5 ( subtract 2x from both sides )

x - 1 = - 5 ( add 1 to both sides )

x = - 4

substitute this value into either of the 2 equations

y = - 8 - 5 = - 13

(9)

2y = 8 - 7x → (1)

4y = 16 - 14x → (2)

multiply (1) by 2

4y = 16 - 14x

Both equations are equal hence any value of x will make them true

example (1, \frac{1}{2}) is a possible solution

The system has an infinite number of solutions






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Answer:

3^x + 10x+2x-4

Step-by-step explanation:

f(x) = 3^x + 10x and g(x) = 2x - 4

(f + g)(x)= 3^x + 10x+2x-4

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Which ordered pairs are solutions to the equation?
soldier1979 [14.2K]


To solve this you want to plug in your x's and y's to see if they match.

A. 3(11)-4=33-4=29 and 29 is not equal to 5 so A is not a solution

B.3(5)-4=15-4=11=11  3(3)-4=9-4=5 and 5 is not equal to 2 so B is not a solution

C. 3(2)-4= 6-4=2 2 is not equal to 3 so C is not a solution

D is the answer. 3(5)-4=11 and 3(2)-4= 2

6 0
3 years ago
find the sum and product of the zeros of the quadratic polynomial are -1/2 and -3.what is the quadratic equation​
11111nata11111 [884]

Answer:

Step-by-step explanation:

let sum of zeros=s

and product of zeros=p

then quadratic equation is x²-sx+p=0

x²-(-1/2)x+(-3)=0

x²+1/2 x-3=0

2x²+x-6=0

5 0
3 years ago
Kasey asked 6 of her friends how many episodes of their favorite show they
ivanzaharov [21]

Answer:

A

Step-by-step explanation:

6 friends

Mean - 10

Median - 9.5

Range - 14

3 friends watched 12, 13, and 18 movies.

Let's find the sum, this will help us find the total number of movies the other 3 friends watched.

12 + 13 + 18 = 43

The mean is all their movies added toether, divided by the number of friends.

m = number of movies the other friends watched.

(43 + m) / 6 = 10        Multiply each side by 6

43 + m = 10 * 6

43 + m = 60          Subtract 43 from each side

m = 60 - 43

m = 17

So we know the total movies the other friends watched is 3.

A. 4+6+7 = 17

B. 4+4+7 = 15

C. 5+8+9 = 22

D. 2+3+5 = 10

We know the answer is A.

We can check it by looking at the Median, the median is the middle number, if there are an even number of samples, you add the 2 middle numbers together and divide by 2.

4, 6, 7, 12, 13, 18

So 7+12 = 19

19/2 = 9.5

So we know for sure A is correct!

3 0
3 years ago
58 yd<br> 73 yd<br> Use 3.14 Instead Of Pie Symbol
defon

Answer:

771096.8 \: yd^{3}

Step-by-step explanation:

If you are trying to find the volume, you would use the formula:

\pi \: r ^{2} (h)

You would plug in the radius (r), which is 58, and then plug in the height, which is 73.

Make sure you remember to use 3.14 and not the pi key if you are using a calculator.

The final answer is 771,096.8 yd^3

7 0
3 years ago
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