1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
soldi70 [24.7K]
3 years ago
5

PLZ I NEED HELP BUT PLZ EXPLAIN WHEN YOU ANSWER

Mathematics
2 answers:
Yuki888 [10]3 years ago
5 0

Here’s the more basic thing you need to know.

3m + 5b = 11
3(.75) + 5(1.75) = 11
2.25 + 8.75 = 11
11 = 11

4m + 4b = 10
4(.75) + 4(1.75)=10
3 + 7 = 10
10 = 10

Let m = cost of a liter of milk
Let b = cost of a loaf of bread

Bhavik bought 3 liters of milk and 5 loaves of bread
for a total of $11 so:
3m + 5b = 11

Prices didn't change and he bought 4 liters of milk
and 4 loaves of bread for $10 a month later so:
4m + 4b = 10

We have two equations:

3m + 5b = 11 equation 1
4m + 4b = 10 equation 2

To eliminate a variable we want the coefficients to add to zero.
Multiply equation 1 by 4 and equation 2 by -3. This will give us
12m in the first equation and -12m in the 2nd equation so that
we can then add the two and eliminate the m variable, thus
allowing us to solve for b.

12m + 20b = 44 4(equation 1)
-12m - 12b = -30 -3(equation 2)
--------------------
0m + 8b = 14 sum of the equations

8b = 14
b = 14/8
b = 1.75

A loaf of bread costs $1.75

Substitute that value into one of the original 2 equations
and solve for m

4m + 4b = 10
4m + 4(1.75) = 10
4m + 7 = 10
4m = 3
m = 3/4
m = .75

A liter of milk costs $.75
A loaf of bread costs $1.75
Natalija [7]3 years ago
3 0

Answer:

Step-by-step explanation:

Let's convert this statement into a system of two equations

3 * (cost of a liter of milk) + 5 * (cost of a loaf of bread) = $11

4 * (cost of a liter of milk) + 5 * (cost of a loaf of bread) = $10

cost of a liter of milk = x

cost of a loaf of bread = y

3x + 5y = 11

4x + 4y = 10

You can now solve this using either substitution or elimination

I'll use elimination. Let's say I want to get rid of the x first. I need to choose numbers to multiply by the top and bottom equations to eliminat the x's. The easiest way to do this is to multiply them by each other. So we'll multiply the top by 4 and the bottom by 3. We'll need to make sure the signs are opposite as well so I'll make that a negative 3 on the bottom.

4 * (3x + 5y = 11)

-3 * (4x + 4y = 10)

12x + 20y = 44

-12x - 12y = -30

Now add straight down

0x + 8y = 14

8y = 14

y = 14/8 = $1.75

Now we can plug this back in to either equation  to find the x. I'll choose the second equation

4x + 4*(1.75) = 10

4x + 7 = 10

4x = 3

x = 3/4 = $0.75

So, cost of a liter of milk = x = $0.75

and cost of a loaf of bread = y = $1.75

You might be interested in
Write an expression that shows how to usethe halving and doubling strategy to find 8 x 50
faust18 [17]
Double of 50 is 100, so 28*100=2800, now half of the answer is 2800/2=1400
3 0
3 years ago
Write the equation of the line that has a slope of 2/3 and passes through (0,-7).
likoan [24]
The equation of the line is (slope-intercept) y=\frac{2}{3}x+(-7) or (standard form) \frac{-2}{3}x+y=-7
6 0
4 years ago
Jim’s father is older than 40 but younger than 50.If you can divide his age by 2,4,5,8,or 10 ,there will be a remainder of 1. Ho
CaHeK987 [17]

Answer:

Step-by-step explanation:

all you have to do is divide each number by 4, 41, 42, 43, 44, 45, 46, 47, 48, 49 ,and 50 until you get a remainder of 1. what I mean is do 2 divided by all the number from 40 50 and do the same with 4,5,8 and 10 until you find one of them that has a remainder of 1. (is a lot of work sorry could't tell you the anwer)

8 0
3 years ago
To put money into a savings account, CDs, and stocks is to___
-BARSIC- [3]

Answer:

I think its to invest.

Step-by-step explanation:

Knowledge, and past experience.

8 0
3 years ago
PLEASE HELP <br> I just wanna be done with this
charle [14.2K]

Step-by-step explanation:

The amount of times you roll the dice x 10 = answer

8 0
3 years ago
Other questions:
  • How many license plates are possible consisting of 4 letters followed by 2 digits, if the first letter must be a C? Repetition i
    7·2 answers
  • Y=3x+8 what is the answer for this slope
    12·1 answer
  • Complete the sentence. 22/7 divided by 2 is ? The value of (22/7 minus 2/3)
    14·1 answer
  • How many times does 2 go in to 56​
    12·1 answer
  • The area of a square is equal to twice the perimeter of the square. find the perimeter of the square.
    15·1 answer
  • Find cos A if a=5, c=13
    10·1 answer
  • Which linear equations have an infinite number of solutions? Check all that apply. (x – ) = (x – left-parenthesis x minus StartF
    10·2 answers
  • Help! Please thank you.
    11·1 answer
  • 30 POINTS SEND ASAP OR I WONT SEE IT! Do both
    14·1 answer
  • 1. Choose the correct answer.
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!