All categories

3 years ago

Which equation is an identity?

Mathematics

2 answers:

irinina [24]3 years ago

7 0

The equation that represents an identity is <span>
3w + 8 – w = 4w – 2(w – 4). w = 8</span>

3241004551 [841]3 years ago

5 0

Answer:

The correct option is 2.

Step-by-step explanation:

The equations that are true for any value of the variable, no matter what value is plugged in for the variable, then they are called Identity equations.

The first equation is

$7m-5=8m+7-m$

$7m-5=7m+7$

Subtract 7m from both the sides.

$-5=7$

This statement is false for any value of m. Therefore this is not an Identity equation.

The second equation is

$3w+8-w=4w-2(w-4)$

Using distributive property,

$2w+8=4w-2w+8$

$2w+8=2w+8$

$0=0$

This statement is true for any value of w. Therefore this is an Identity equation.

The third equation is

$9-(2v+3)=-2v-6$

$9-2v-3=-2v-6$

$-2v+6=-2v-6$

$6=-6$

This statement is false for any value of v. Therefore this is not an Identity equation.

The fourth equation is

$-3y+3=-3y-6$

Add 3y on both the sides.

$3=-6$

This statement is false for any value of y. Therefore this is not an Identity equation.

Hence the correct option is 2.

You might be interested in

A school cafeteria sold 1,600 slices of pizza the first week, 800 the second week, 400 the third week if this patter continues,

Mariulka [41]

Answer:

6th week.

Step-by-step explanation:

Each week he is selling 1/2 of the week before so

In the 3rd week he sells 400

- in the 4th week it will be 200

- in 5th week 100

- in 6th seek 50.

7 0

3 years ago

Read 2 more answers

An animal gained 2 pounds steadily over 10 years. What is the unit rate of pounds per year

Jet001 [13]

0.2 is the answer.

Divide 2 by 10 to get your answer.

6 0

3 years ago

Mobile devices offer consumers an access channel of ever-increasing importance, as demonstrated consumers’ ability to find water

rosijanka [135]

Answer:

technological

Step-by-step explanation:

According to my research on studies conducted by various sociologists, I can say that based on the information provided within the question this is an example of a trend within the technological environment. This is because technology helps create opportunities as well as allowing new ways of doing certain things. Like in this case finding bottle filling stations.

I hope this answered your question. If you have any more questions feel free to ask away at Brainly.

7 0

3 years ago

Two planes are driving toward each other with the speeds 250 mph and 420 mph respectively. If the distance between them are 1250

lakkis [162]

Answer:

They will meet in 1.866 hours.

Step-by-step explanation:

This is actually quite a simple question once we think about it in a different way.

Instead of thinking of two different planes that are going at two different speeds, think of it like this: the distance between the two planes is decreasing by 670mph (250mph + 420 mph).

Note: miles per hour is equivalent to miles/hour (<em>miles divided by hours</em> or <em>miles over hours</em>)

670m/h becomes our new rate. The rate the distance between the planes is decreasing.

Now, if the distance between them is 1250 miles, how long until they meet?

If we have miles and multiply it by hours/miles, the miles cancel out and you are left with hours.

We have miles (1250) and miles/hours (670). If we multiply these we get units of miles^2 / hours which is not what we want.

we need to multiply 1250 miles by something with the units of hours/miles.

It turns out that the reciprocal of miles/hours is hours/miles

That means we need to multiply 1250 miles by the reciprocal of 670 miles/hours

Note: the reciprocal of a fraction is the fraction flipped around. 1/2 becomes 2/1, reciprocal of 3/5 is 5/3, etc...

the reciprocal of 670 miles/hours = 1/670 miles/hours

Multiplying 1250 miles by 1/670 miles/hours is the SAME as

dividing the number of miles(1250m) by the rate(670m/h)

1250m / 670m/h = 1250m x 1/670 x h/m = 1.866 h = 1.866 hours (the miles cancel out)

<h2>Note: I explained it so you know why dividing 1250miles by 670mph gives you hours. Once you understand why, all you need to do in the future is divide the distance by the rate and you get time. </h2><h2>Distance / rate = time</h2><h2 />

8 0

3 years ago

There are 1600 students in a school. 47.5% of them are male. How many are female?

ch4aika [34]

Answer: 47.5% of 1600= 760 males which means 840 are females

Step-by-step explanation:

7 0

3 years ago

Read 2 more answers