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
Burka [1]
3 years ago
11

15. 3x – 4y = -1 5x + 2y = 7

Mathematics
1 answer:
never [62]3 years ago
8 0

Answer:

x = 1, y = 1

Step-by-step explanation:

3x - 4y = -1

5x + 2y = 7

If we multiply the whole second equation by 2, we get:

10x + 4y = 14

Adding this to the first equation:

10x + 4y + 3x - 4y = 14 - 1

13x = 13

x = 1

Applying this to the second equation:

5 (1) + 2y = 7

2y = 2

y = 1

You might be interested in
Use the elimination method to solve the system of equations. Choose the correct ordered pair<br>​
UkoKoshka [18]

Answer:

Answer is B

Step-by-step explanation:

12x - y = 25 \\ 9x + y = 17 \\ x =  \frac{17 - y}{9}  \\ 12( \frac{17 - y}{9} ) - y = 25 \\

\frac{204}{9}  -  \frac{12}{9} y - y = 25 \\  \frac{204}{9}  -  \frac{21y}{9}  = 25 \\  -  \frac{21y}{9}  = 25 -  \frac{204}{9}  \\  -  \frac{21y}{9} =  2.33 \\ - 21y =  20.997 \\ y =  - 0.99

y =  - 1 \\ x =  \frac{17 - y}{9}  \\ x =  \frac{17 -  - 1}{9}  =  \frac{18}{9}   \\ x = 2

5 0
3 years ago
Pleeeeease someone help!!! I will give brainliest!!! 31 POINTS IF U ANSWER!!
natta225 [31]

Answer:

Its going to be a line going straight across the 4 along the y axis .

Step-by-step explanation:

See graph attached

4 0
3 years ago
Read 2 more answers
Help Please 20 POINTS <br> Which expressions are equivalent to the following?
o-na [289]

Answer:

\large\boxed{5x(6x-x-2)}\\\\\boxed{-5(-6x^2+x+2)}\\\\\boxed{5(2x+1)(3x-2)}

Step-by-step explanation:

30x^2-5x-10=5(6x^2-x-2)=5(-1)(-6x^2+x+2)=-5(-6x^2+x+2)\\\\30x^2-5x-10=30x^2+15x-20x-10=15x(2x+1)-10(2x+1)\\\\=(2x+1)(15x-10)=(2x+1)(5)(3x-2)=5(2x-1)(3x-2)

4 0
3 years ago
A one year membership to metro gym costs $460. There is a fee of $40 when you join, and the rest is paid monthly. Write an equat
zysi [14]

Answer: The equation that would help members to find how much they would pay per month is

40 + 12x = 460

Step-by-step explanation:

Let x represent the amount of money that members would pay per month.

Let y represent the number of months for which a member uses the gym.

There is a fee of $40 when you join, and the rest is paid monthly. This means that the cost of using the gym for x months would be

40 + xy

A one year membership to metro gym costs $460. Therefore are 12 months in a year. Therefore,

40 + 12x = 460

12x = 460 - 40 = 420

x = 420/12 = 35

The equation that would help members to find how much they would pay per month is

8 0
3 years ago
The cost of a new laptop is $750 which generates a sales tax amount of 37.50. What is the sales tax rate.
viva [34]

Answer:

5 percent.

Step-by-step explanation:

Divide tax by the cost to see the percentage of the tax.

750/37.50=0.05

5 percent.

4 0
3 years ago
Other questions:
  • HELP ME PLEASE !!! I NEED IT
    8·1 answer
  • Michelle had a balance of -$43 in her account. The bank charged her a fee of $15 for having a negative balance. What is her new
    14·1 answer
  • The larger of two numbers is 12 times the smaller number. if the sum of two numbers is 15,600, find the two numbers.​
    9·1 answer
  • Find the numbers a, b and c if the polynomial x3−18x2+24xb−c is the cube of the binomial x+2a.
    11·1 answer
  • Triangles SLB and DOG are similar with &lt;S=&lt;D and &lt;L =&lt;O. If SL, LB and SB are 3,4,5 respectively and DO=5 find OG an
    15·1 answer
  • 52÷875 as a mixed number with an explanation.
    8·2 answers
  • You are at an pear picking farm and they allow you to pick up to 50 pears a day. Today, you have already picked 14 pears. Which
    5·1 answer
  • Can someone check my answers an see if correct. TYSM!!<br> ΔEFG ≅ ΔHJK
    13·1 answer
  • HALP ME PLSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS
    8·1 answer
  • the dimensions of kaly's new cell phone are 6 inches by 8 inches. her phone cost 30 per square inch how much did kayla pay for t
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!