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natali 33 [55]
3 years ago
11

How can you solve problems involving equivalent expressions?

Mathematics
2 answers:
jarptica [38.1K]3 years ago
8 0
<span>Setting expressions equal to one another gives us an equation.

In an equation, our goal is to isolate the variable; we must "undo" everything that has been done to the variable. We work backward; the last thing done to the variable will be the first thing we undo.

We "undo" things by performing the opposite operation; for instance, if the last thing done to our variable was that 3 was subtracted from it, we would undo that first by adding 3 to both sides.

What we do to one side we must do to the other in order to preserve equality.

We would continue this process of working backward until the variable was isolated; this would give us our solution.</span>
Akimi4 [234]3 years ago
6 0

Solution

Consider Case 1

Find cost of 4 pens and 5 pencils if cost of one pen is $ x and Cost of one pencil is $ y.

So, Total cost of 4 pens and 5 pencils is given by: Z= 4 x + 5 y

Case 2:

The cost of one kg of wheat is $ R and one kg of Rice Cost $ S.Find the total cost of 4 Kg of wheat and 5 Kg of rice.

So, Cost of 4 Kg of wheat and 5 Kg of rice,M= 4 R + 5 S

4 x + 5 y= 4 R + 5 S

As, in both the cases  , total cost ,Z as well as M are equivalent expressions.

So, as there are two variables in each case, as coefficient of variables being the same.

So, just substitute different integral or real values of variables ,and we will get the result according to given problem.

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URGENT DUE BY 1:00 FOR MY FINAL GRADE PLEASE HELP OR I WILL FAIL SEMESTER WILL RATE GOOD THX BLESS YOU!!!!
Lesechka [4]
F(x) = 3x + 11
Is the function used to show this.

when you know this, you are able to do the following:
f(10) = 30 + 11 = $41
That would be the allowance of the 10th week.

The question, however wants the total.

This again, can be done like this:
f(1) + f(2) + f(3) + f(4) + f(5) + f(6) + f(7) + f(8) + f(9) + f(10) = $275 :)
14 + 17 + 20 + 23 + 26 + 29 + 32 + 35 + 38 + 41 = $275

Sure there is a better formula, but i couldnt seem to make it, sorry.

HUGE UPDATE: The sum is $275 not 200..


3 0
3 years ago
Read 2 more answers
Four glasses of milk and 2 snack bars have a total of 72 carbohydrates​ (carbs), and 2 glasses of milk and 3 snack bars have a t
Travka [436]

One glass of milk has 11 carbs and one snack bar has 14 carbs.

Step-by-step explanation:

Let,

Glass of milk = x

Snack bar = y

According to given statement;

4x+2y=72   Eqn 1

2x+3y=64   Eqn 2

Multiplying Eqn 2 by 2

2(2x+3y=64)\\4x+6y=128\ \ \ Eqn\ 3

Subtracting Eqn 1 from Eqn 3

(4x+6y)-(4x+2y)=128-72\\4x+6y-4x-2y=56\\4y=56

Dividing both sides by 4

\frac{4y}{4}=\frac{56}{4}\\y=14

Putting y=14 in Eqn 1

4x+2(14)=72\\4x+28=72\\4x=72-28\\4x=44

Dividing both sides by 4

\frac{4x}{4}=\frac{44}{4}\\x=11

One glass of milk has 11 carbs and one snack bar has 14 carbs.

Keywords: linear equations, subtraction

Learn more about linear equations at:

  • brainly.com/question/5461619
  • brainly.com/question/5510873

#LearnwithBrainly

6 0
3 years ago
Scarlet has $85 to spend at the pet store. She is definitely buying a catfish for $12, a rainbowfish for $13, and a betta fish f
ikadub [295]

Subtract the total of the 3 fish she is buying from the amount of money she has:

85 - (12 + 13 + 14) = 85 - 39 = 46

She has $46 to spend on crabs.

Divide the amount she has to spend by the price on one crab:

46 / 8 = 5.75

Since it isn't a whole number you need to round down, since she cant buy 0.75 of a crab.

She has enough money to buy 5 crabs.

7 0
3 years ago
Please help me with 2 questions, it's urgent.
Hunter-Best [27]
Answer for the second question:
5*2 is 10
10 *2 is 20
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80 *2 is 160
That's five hours
160*2 is 320
320*2 is 640
640*2 is 1280
1280*2 is 2560
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I forgot how to do it with the equation sorry
7 0
3 years ago
HELP ME I WILL BRAINLIST U ​
ANEK [815]

Answer:

C

Step-by-step explanation:

This question you can use simple elimination, can save you time if it's right. Obviously its not A or B as the hypotenous needs to be bigger than the base. Knowing the base is 32, there is not enough room to justify an additional 20 feet, eliminating D. Answer must be C. If you wanted to do it the right way use trig/socatoa to find the missing hypotenouse as the top angle of the triangle is 45, just like the other upside down one.

7 0
3 years ago
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