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Mashutka [201]
3 years ago
14

Evaluate the expression when x=3 and y=-4 . -6x+yEasyyyy....

Mathematics
1 answer:
RSB [31]3 years ago
7 0

Answer:

-22

Step-by-step explanation:

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Resuelve:
jok3333 [9.3K]

Answer:

A partir del problemas vamos a crear una ecuación donde X es una docena de huevos y Y una libra de mantequilla

entonces: 4 docenas de huevos y 3 libras de mantequilla es igual a 14.100

en mi primera ecuación seria: 4X + 3Y = 14.100

ahora haremos la segunda ecuacion: tres docenas y 1 libra de mantequilla

en mi segunda ecuación seria: 3X + 1Y = 8.700 el plan es sumar las dos ecuaciones pero yo quiero que al sumarlas la variable "Y" desaparezca así que mi segunda ecuación la voy a multiplicar pór (-3) quedándome todo así:

primera ecuación: 4X + 3Y = 14.100

segunda ecuacion multiplicada por -3: -9X - 3Y = -26.1

al sumarlas obtengo como resultado: -5X = -12

resolviendo esa ecuacion obtengo que X=  

X=2.4

luego reemplazas X en la primera ecuación: 4X + 3Y = 14.100

reemplazando seria: 4 x (2.4) + 3Y =14.100

9.6 + 3Y = 14.1000

3Y= 14.100 - 9.6

Y=  

Y=1.5

entonces concluimos que la docena de huevos cuesta 2.4 $ y la libra de mantequilla 1.5 $

Step-by-step explanation:

4 0
3 years ago
Given two sets of polar coordinates that could be used to play the given point
topjm [15]

Answer:  a.  (2.5, 300°)  and  (-2.5, 120°)

               b.  (4, 270°)    and   (-4, 90°)

<u>Step-by-step explanation:</u>

Polar coordinates are written as (r, θ)    where

  • r is the radius
  • θ is the angle

In the first graph, the radius is 2.5 and the angle is 300° --> (2.5, 300°)

You can also list the radius as -2.5 at angle 120° --> (-2.5, 120°)

                                                                           ↓

                                                                    (300 - 180)

In the second graph, the radius is 4 and the angle is 270° --> (4, 270°)

You can also list the radius as -4 at angle 90° --> (-4, 90°)

                                                                      ↓

                                                                (270 - 180)

5 0
3 years ago
Write two forms for 40,023,032
Tema [17]
Fourty million, twenty-three thousand, thirty-two.

40,000,000 + 20,000 + 3,000 + 30 + 2
3 0
3 years ago
How would you solve this:
kykrilka [37]
3xy over 8 is the answer go to mathway
 and you can find your answer and it shows you how to do it


7 0
3 years ago
It is believed that 43% of the US population can play the piano, 28% can play the guitar, 15% can play the harmonica, 12% can pl
melomori [17]

Answer:

The smallest sample size to satisfy the conditions is n=500.

Step-by-step explanation:

The condition for performing the inference related to the sample size is that, for all the categories, the expected success and failures in the sample are at least 10:

np\geq10\\\\n(1-p)\geq10

The largest sample size required will be for the minimum p or (1-p).

This happens to be the proportion that can play other instruments: 2%.

Then, we can calculate the minimum sample size as:

np\geq10\\\\n(0.02)\geq10\\\\n\geq(10/0.02)\\\\n\geq500

6 0
3 years ago
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