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
eimsori [14]
3 years ago
14

3x - 7y = -40 3x - 2y = -4

Mathematics
2 answers:
eimsori [14]3 years ago
5 0

Answer:

What are you solving for?

Step-by-step explanation:

zmey [24]3 years ago
3 0

Answer:

(7.5,4.1)

Step-by-step explanation:

Given

3x_7y =_40

3x_2y=_4

sol

3x_7y=_40..... equation 1

3x_2y=_4 ..... eq 2

here

eq 2 multi 3 eq 1 multiply 3

9x_21y=_120

9x_6y=_12

_ + = +

__________

0x+ 15y =108

y=108÷15

y=7.5

the y value putting the eq 1

3x_7y=_40

3x_7×7.5=_40

3x_52.5=_40

3x=52.5_40

3x=12.5

x=12.5÷3

x=4.1

You might be interested in
Helen got a 7% reduction in the price of a pair jeans that are normally $32. What is the approximate percent in the price?
adoni [48]

A percentage is a way to describe a part of a whole. The approximate percent decrease in the price is 21.87%, thus, the correct option is B.

<h3>What are Percentages?</h3>

A percentage is a way to describe a part of a whole. such as the fraction ¼ can be described as 0.25 which is equal to 25%.

To convert a fraction to a percentage, convert the fraction to decimal form and then multiply by 100 with the '%' symbol.

Given the reduction in the price is $7, while the original cost is $32. Therefore, the approximate percent decrease in the price is,

Percentage decrease = 7/32  × 100%

                                     = 21.87%

Hence, the approximate percent decrease in the price is 21.87%, thus, the correct option is B.

The correct question is:

Helen got a $7 reduction in the price of a pair of jeans that are normally $32. What is the approximate percent decrease in the price?

The percent decrease is approximately 15%.

The percent decrease is approximately 21%.

The percent decrease is approximately 43%.

The percent decrease is approximately 78%

Learn more about Percentages:

brainly.com/question/6972121

#SPJ1

7 0
1 year ago
Evaluate the expression when a = 4 and b = 6. 8a – 4b + 5 A. 15 B. 7 C. 19 D. 13
yaroslaw [1]
4 and b = 6 is D.) 13
4 0
3 years ago
Is 0.71428571428 a rational number
Alex787 [66]
No, since it a repeating(terminating) decimal, so it is not a rational number.

5 0
3 years ago
Read 2 more answers
9mph in still water it takes 5hrs longer to travel 74 miles upstream than downstream find the rate of current and round to neare
prohojiy [21]

Answer:

The rate of current is 2.5 mph.

Step-by-step explanation:

The speed in the water when current is absent is 9 mph.

If the speed of the current is v mph then the upstream speed is (9 - v) mph and the downstream speed is (9 + v) mph.

Now, it takes 5 hours longer to travel 74 miles upstream than down stream, then we can write the equation as  

\frac{74}{9 - v} - \frac{74}{9 + v} = 5

⇒ \frac{2v}{81 - v^{2} } = \frac{5}{74}

⇒ 148v = 405 - 5v²

⇒ 5v² + 148v - 405 = 0

Applying Sridhar Acharya's formula we can write  

v = \frac{-148 + \sqrt{148^{2} - 4(5)(-405) }  }{2(5)} (Neglecting the negative root)

⇒ v = \frac{- 148 + 173.2166}{10} = 2.5 mph (Rounded to the nearest 10th) (Answer)

7 0
3 years ago
An easy way to explain...
Mashcka [7]
it's very simple, 694-72= 622
so in order for you to check you answer you do the opposite
694-72 would equal 622
622+72 would equal 694
7 0
3 years ago
Read 2 more answers
Other questions:
  • I will do anything if you answer!!! There's a photo!!! PLEASE!!!
    13·1 answer
  • EASY BRAINLIEST!
    5·2 answers
  • HELP ME
    14·1 answer
  • I need to know how to do it and get the answer
    15·1 answer
  • Please Help! I need an explanation for how to do this... Step-by-step directions would be great!
    14·1 answer
  • The length of a rectangle is twice it’s with the perimeter of a rectangle is 126 feet.
    7·1 answer
  • The mass of 5m^3 of copper is 44800kg. Work out the density of copper.
    10·1 answer
  • Determine the height of the can of beans(cylinder) given the volume of the
    11·1 answer
  • 1/4( -1 + 4)+3/5 please help ME missing work!
    13·1 answer
  • If f(x) =2x-1 and g(x)=x^2-3x-2 find (f +g) (x)
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!