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
Gnoma [55]
3 years ago
5

Solve equations by using elimination -4+5y= 13 X-5y=21 ( , )

Mathematics
1 answer:
tigry1 [53]3 years ago
5 0

Answer:

y=17/5 ,x= 38

Step-by-step explanation:

-4+5y =13 add 4 both side

4-4+5y=13+4

5y=17

5y/5=17/5 y=17/5

x-5y=21

x-5(17/5)=21

x-17=21

x=21+17= 38

You might be interested in
1.6E-8 is equal to what numbers or scientific notation?
prisoha [69]
It's equal to 1.6x10^(-8)
7 0
3 years ago
If the width of the rectangle is three times the length and the perimeter of the rectangle is 72 ft, what are the length and wid
goblinko [34]
W=3L
W+W+L+L=72
Replace W with 3L: 3L+3L+L+L=72
8L=72
L=9
W=27
8 0
3 years ago
Given cos x=0.4762,find the degree measure of x.round your answer to the nearest tenth
alex41 [277]

If you have a calculator, you can use the inverse cos " cos⁻¹ " key. Many upper level books write that as Arccos so as not to confuse you with a negative exponent. We do that because if you take the cosine of any angle, and then the inverse cosine of any angle, it leads you back to the original angle. Think of it as a big "UNDO" button.

To one decimal place, that result is 61.6 degrees.

5 0
3 years ago
How many ways can 10 runners finish first, second, and third in a race?
olga nikolaevna [1]
Let's call the 10 runners A B C D E F G H I J
ABC
ABD
ABE
ABF
ABG
ABH
ABI
ABJ
ACB
ACD
ACE
ACF
ACG
ACH
ACI
ACJ
ADB
ADC
ADE
ADF
ADG
ADH
ADI
ADJ
AEB
AEC
AED
AEF
AEG
AEH
AEI
AEJ
AFB
AFC
AFD
AFE
AFG
AFH
AFI
AFJ
AGB
AGC
AGD
AGE
AGF
AGH
AGI
AGJ
AHB
AHC
AHD
AHE
AHF
AHG
AHI
AHJ
AIB
AIC
AID
AIE
AIF
AIG
AIH
AIJ
AJB
AJC
AJD
AJE
AJF
AJG
AJH
AJI
The above is 60 different ways, but now B C D E F G H I J have to come first, and the proses starts again, until we have covered them all. I'm not going to write them all out but in theory, there is 540 different ways. 9*60=540.
4 0
3 years ago
Evaluate the function at x = -2.
Lera25 [3.4K]

Answer:

B. y=0

Step-by-step explanation:


7 0
3 years ago
Other questions:
  • A line has a slope of - 2/3 and passes through the point (-3, 8) what is the equation of the line
    5·1 answer
  • What’s 3yrs and 4 months as a decimal?
    14·1 answer
  • How to solve -6x + 3y = 18<br> Y=2x - 2
    12·2 answers
  • A rectangular prism with a square base is cut from the center of a triangular prism. Each side of the square base measures 1.7 u
    13·2 answers
  • Somebody answer this!!! pls!!!
    12·2 answers
  • How do I write 7^2 (4 - 15x) in written form?
    8·1 answer
  • Solve the following system of equations graphically on the set of axes below. Y=-x+1 Y=1/4x+6
    15·1 answer
  • Which of the following is the solution to the equation - y = 24?
    7·1 answer
  • Plssssss answerrrrrrr
    6·1 answer
  • PLSSS HELP IF YOU TURLY KNOW THISS
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!