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Shalnov [3]
3 years ago
11

To solve this system of equations by elimination, what operation could be used to eliminate the x-variable and find the value of

y?
−6x − 4y = 2
−4x − 7y = 2
Mathematics
1 answer:
stepan [7]3 years ago
7 0

Answer:

see explanation

Step-by-step explanation:

Given the 2 equations

- 6x - 4y = 2 → (1)

- 4x - 7y = 2 → (2)

Multiplying (1) by 4 and (2) by - 6 will eliminate the x- term

- 24x - 16y = 8 → (3)

24x + 42y = - 12 → (4)

Add (3) and (4) term by term

26y = - 4 ( divide both sides by  26 )

y = \frac{-4}{26} = - \frac{2}{13}

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-4/9 * -5/8 I really want to know the answer home work is due and I need a explanation
lilavasa [31]
-4/9 times -5/8 you can cross cancel the 4 and 8 so it makes the problem -1/9 times -5/2 which equals -5/18
4 0
2 years ago
The video states that 78% of people carry less than $50 in cash; 40% carry less than $20 in cash, and 9% carry no cash. Suppose
Inessa05 [86]

Answer:

The probability that 12 people in your sample are carrying no cash is 0.0712

Step-by-step explanation:

n = 100

p(no cash) = 0.09

x = 12

By applying binomial distribution

P(x,n) = nCx*px*(1-p)(n-x)

P(x = 12) = 0.074.

The probability that 12 people in your sample are carrying no cash is 0.074.

n = 100

p(less than 50) = 0.78

x = 75

By applying binomial distribution

P(x,n) = nCx*px*(1-p)(n-x)

P(x = 75) = 0.0712

The probability that 12 people in your sample are carrying no cash is 0.0712

6 0
3 years ago
An instructor who taught two sections of engineering statistics last term, the first with 25 students and the second with 40, de
Pavlova-9 [17]

Answer:

the answer is b

Step-by-step explanation:

8 0
3 years ago
Steps to solve a two step equation
Kobotan [32]
I'm not entirely sure about some of these because there could be multiple answers, i think. i'll just leave the ones i can't help you with blank.

1) Begin to (isolate) the (variable) by eliminating the (constant). To eliminate the constant, you want to make it (cancel?) because ___+___=___)
2) (Balance) your equation by doing the exact same thing in the opisite side of the (equal sign). 
3) Finish (isolating) the (variable) by eliminating the (coefficient). To eliminate the coefficient, you want to make it (cancel?) because ___x___=___,
4) (Balance) your equation by doing the exact same thing on the opposite side of the (equal sign). 
5) Check your answer by (plugging) it in or the _____. 

honestly, i find it really amusing that they found a way to break a TWO-step equation into 5 steps ?? but i hope this helps a little!!
7 0
2 years ago
Identify the domain of the relation.* {(8,5), (2, 2), (-9, 4), (-7,-4), (-7, 7) }​
mario62 [17]

Answer:

8, 2, - 9, - 7

Step-by-step explanation:

The domain is the first coordinate of an ordered pair. This means that the domain is going to be x. In this set of ordered pairs, the domain is 8, 5, - 9,   - 7.

Hope This Helps :)

6 0
3 years ago
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