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
____ [38]
3 years ago
6

© Solve the simultaneous equations -3x + y= – 8 3x + 2y = – 13 X =? y =?

Mathematics
1 answer:
DENIUS [597]3 years ago
5 0

Answer:

x=1/3

y=-7

Step-by-step explanation:

using the elimination method, you can add both equations vertically, to eliminate the x

-3x+y=-8

3x+2y=-13

3y=-21

y=-7

we then fix the value of y into the first equation

-3x+y=-8

-3x-7=-8

-3x=-8+7

-3x=-1

x=1/3

You might be interested in
PLEASE HELP ON TIMER!!!!!
Lesechka [4]

Answer:

8

Step-by-step explanation:

6 0
3 years ago
) For which values of x is f '(x) zero? (Enter your answers as a comma-separated list.) x = (No Response) For which values of x
grigory [225]

Answer:

Check below, please

Step-by-step explanation:

Step-by-step explanation:

1.For which values of x is f '(x) zero? (Enter your answers as a comma-separated list.)

When the derivative of a function is equal to zero, then it occurs when we have either a local minimum or a local maximum point. So for our x-coordinates we can say

 f'(x)=0\: at \:x=2, and\: x=-2

2. For which values of x is f '(x) positive?

Whenever we have  

 f'(x)>0

then function is increasing. Since if we could start tracing tangent lines over that graph, those tangent lines would point up.

 f'(x)>0 \:at [-4,-2) \:and\:(2, \infty)

3. For which values of x is f '(x) negative?  

On the other hand, every time the function is decreasing its derivative would be negative. The opposite case of the previous explanation. So

 f'(x)

4.What do these values mean?

 f(x) \:is \:increasing\:when\:f'(x) >0\\\\f(x)\:is\:decreasing\:when f'(x)

5.(b) For which values of x is f ''(x) zero?

In its inflection points, i.e. when the concavity of the curve changes. Since the function was not provided. There's no way to be precise, but roughly

at x=-4 and x=4

6 0
3 years ago
a store is selling uniform shirts for 18.95 each. if samuel has a coupon for 1/4 off the price, how much would he pay for the sh
balandron [24]
First take the original price and multiple by 1/4 or .25. You should get 4.73 then you subtract that from 18.95 and your answer is 14.22
5 0
2 years ago
Simplify<br> 5т — п — 5п + 2
grigory [225]

Answer:

5t-4n+2

Step-by-step explanation:

n-5n=-4n

5t-4n+2

8 0
3 years ago
A courier service advertises that its average delivery time is less than six hours for local deliveries. A random sample of size
Diano4ka-milaya [45]

Answer, Step-by-step explanation:

According to the exercise, we evaluate the delivery time of a courier company and we will hypothesize the best case with a sample size of 10, which is:

Small sample T test for single mean

The hypothesis that we will develop will be the following:

null hypothesis = mu> = 6

hypothesis alternativa: <6

3 0
3 years ago
Other questions:
  • Which of the following employees has the greatest total employee compensation?
    5·2 answers
  • In a wood there are 420 silver birch trees 160 oak trees and 300 wild cherry trees what percentage is the oak trees give answer
    12·2 answers
  • NEED QUICK HELP.
    8·1 answer
  • A particle moves along a straight line. The distance of the particle from the origin at time t is modeled by the equation below.
    14·1 answer
  • When three pipes fill a pool, they can finish in 12 hours. Two of the pipes can finish in 18 hours if they are working together.
    7·1 answer
  • You are given this equation: 2(6x + 6)= 3(x – 4) + 5. What is the first step in solving for x? Why?
    9·1 answer
  • Give good evidence to back it up and i will give brainliest. thnx to whoever helps.
    8·1 answer
  • A person can walk at a rate of 2 ½ miles per hour. How long would it take the person to walk 10 miles?
    14·2 answers
  • Can somebody plz help answer all these questions (like what to add to solve it)
    11·2 answers
  • Juan’s classroom is shaped like a rectangle. The room is 40 feet long and 25 feet wide. Which rectangle could be a scale drawing
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!