All categories

3 years ago

Solve the following system of equations using the elimination method.

Mathematics

1 answer:

liraira [26]3 years ago

4 0

Answer:

Step-by-step explanation:

12x + 14y = 20

-8x - 14y = -4

4x = 16

x = 4

6(4) + 7y = 10

24 + 7y = 10

7y = -14

y = -2

(4, -2)

the solution is B

You might be interested in

HELPPP PLEASEEEE :) !!!!!

Juliette [100K]

Answer:

wu need help with

Step-by-step explanation:

that's easy it a

5 0

3 years ago

Please help me ASAP!! Thx

brilliants [131]

Answer:

Step-by-step explanation:

The fraction simplifies to 9 ^5

9^5 x 9^3 = 9^8

3 0

2 years ago

How do you know if the equation for a problem is multiplication

enyata [817]

How do you know if the equation for a problem is multiplication? Well, lets go and review: Multiplication is :A mathematical operation performed on a pair of numbers in order to derive a third number called a product. For positive integers, multiplication consists of adding a number (the multiplicand) to itself a specified number of times. Thus multiplying 6. :)

7 0

3 years ago

Read 2 more answers

Can someone Help plz!!

Natasha_Volkova [10]

No clue fubriffnirfbiddb

7 0

3 years ago

A recent study focused on the number of times men and women send a Twitter message in a day. The information is summarized below

jok3333 [9.3K]

Answer:

The value of the test statistic = 2.58

Test statistic Z = - 4.805

|Z| = 4.805 > 2.58

Null hypothesis is rejected The value of the test statistic = 2.58

There is significant difference between in the mean number of times men and women send a Twitter message in a day

Step-by-step explanation:

Step(i):-

Sample size of men n₁ = 25

mean of the first sample x₁⁻ = 20

Standard deviation of the first sample σ₁ = 5

Sample size of women n₂ = 30

mean of the second sample x₂⁻ = 30

Standard deviation of the first sample σ₂ = 10

Level of significance ∝= 0.01

Step(ii):-

Null Hypothesis : H₀: There is no significant difference between in the mean number of times men and women send a Twitter message in a day

Alternative Hypothesis :H₁:There is significant difference between in the mean number of times men and women send a Twitter message in a day

Test statistic

$Z = \frac{x^{-} _{1} - x^{-} _{2} }{\sqrt{\frac{S.D_{1} ^{2} }{n_{1} }+\frac{ S.D_{2} ^{2}}{n_{2} } } }$

$Z = \frac{20 - 30 }{\sqrt{\frac{(5)^{2} }{25 }+\frac{ (10)^{2} }{ 30} } }$

Z = $\frac{-10}{2.081} = - 4.805$

The value of the test statistic = 2.58 C

|Z| = 4.805 > 2.58

Null hypothesis is rejected The value of the test statistic = 2.58

Conclusion:-

There is significant difference between in the mean number of times men and women send a Twitter message in a day

7 0

3 years ago