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
The Empire State building in New York City is 1,250 feet tall. It has 103 floors. Rounded to the nearest whole, what is the heig
Tems11 [23]
-----------------------------------------12ft
4 0
3 years ago
Read 2 more answers
What is the slope of the line <br> -3x+5y=2x+3y
GaryK [48]
X=2/5y
hope this helps!
8 0
3 years ago
Read 2 more answers
Cody is cooking pancakes. The recipe calls for 5 3/10 cups of flour. He accidentally put in 8 1/4 cups. How many extra cups did
Eddi Din [679]

Answer:

59/20 cups

Step-by-step explanation:

5 3/10

8 1/4

Common denimainator  is 40

5 3/10 = 5 12/40

8 1/4 = 8 10/40

Now we can subtract:

330/40-212/40=118/40

118/40= 59/20 cups

Sorry if I spelled some words wrong

3 0
2 years ago
What is the axis of symmetry for the graph of y =2x^2-8x+2? x=
Tanzania [10]

You can use this equation to find the axis of symmetry or the vertex of the quadratic equation as long as it is in standard form

X= (-b/2a)

The answer is x=2

6 0
3 years ago
(18—12)^2+(16/4)/-10+12<br> Find the simplest form
NARA [144]
The answer would be 38
4 0
2 years ago
Other questions:
  • A training field is formed by joining a rectangle and two semicircles, as shown below. The rectangle is 98m long and 76m wide.
    6·1 answer
  • 62 POINTS!!!
    7·2 answers
  • Simplify an expression 3(4x+y) + 2(3x-5y)
    9·2 answers
  • 7. You draw a card from a poker deck, replace it, and draw
    10·2 answers
  • PLEASE HELP!!
    12·1 answer
  • The upper-right number on a check that helps you keep track of checks written is called a
    11·1 answer
  • 4.
    12·2 answers
  • Which classification best describes the relationship between &lt;2 and &lt;4?
    13·1 answer
  • What is the domain of f(x)=(1/3)^x
    5·1 answer
  • Negative 4 (2 x + 3) = 2 x + 6 minus (8 x + 2)
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!