All categories

3 years ago

X+y=8 2x+y=2 Any one out there please help me out

Mathematics

1 answer:

DiKsa [7]3 years ago

8 0

Answer:

(- 6, 14 )

Step-by-step explanation:

Given the 2 equations

x + y = 8 → (1)

2x + y = 2 → (2)

Multiplying (1) by - 1 and adding to (2) will eliminate the y- term

- x - y = - 8 → (3)

Add (2) and (3) term by term to eliminate y, that is

x = - 6

Substitute x = - 6 into either of the 2 equations and evaluate for y

Substituting into (1)

- 6 + y = 8 ( add 6 to both sides )

y = 14

solution is (- 6, 14 )

You might be interested in

Pattern:

Radda [10]

Answer:

Sue is correct

Step-by-step explanation:

because of the simple fact that the numbers are increasing and not decreasing so why would they do 8n-6

8 0

3 years ago

Kevin is 3 years older than twice Jane's age. The sum of their ages is 39. How old is each person?

podryga [215]

Answer:

39 - 3 = 36

36/3 = 12

j = 12

Step-by-step explanation:

4 0

3 years ago

HW 5.2

Marizza181 [45]

Answer:

The probability of no correct answers is 0.125 = 12.5%.

Step-by-step explanation:

For each question, there are only two possible outcomes. Either it is answered correctly, or it is not. The probability of a question being answered correctly is independent of any other question, which means that we use the binomial probability distribution to solve this question.

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

$P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}$

In which $C_{n,x}$ is the number of different combinations of x objects from a set of n elements, given by the following formula.

$C_{n,x} = \frac{n!}{x!(n-x)!}$

And p is the probability of X happening.

3 trials, each with probability of success (correct) given by p=0.50.

This means that $n = 3, p = 0.5$

The probability of no correct answers is

This is P(X = 0).

$P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}$

$P(X = 0) = C_{3,0}.(0.5)^{0}.(0.5)^{3} = 0.125$

The probability of no correct answers is 0.125 = 12.5%.

6 0

3 years ago

Marcus has $30 but needs a total of $45 to buy a new soccer jersey. What percent of the money has he saved for the purchase?

Dimas [21]

Answer:

30 is 66.67% of 45.

please mark brainliest :)

7 0

3 years ago

If a room is 20 by 24 feet, how big is it on a floor plan where 1/2 inch represents 1 foot?

Naddik [55]

Well if you take the room being 20 x 24. Thats 480 feet. But you want how large in 1/2 inch. 1/2 inch is 1/24 of a foot. So if we take 480 feet being 1 and times it by 24. (480 x 24) You get 11,520 half inches. Brainliest would be much appreciated if you feel its deserved.

6 0

3 years ago