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
suter [353]
3 years ago
12

9x-2y=19 7x=21 can you please help me answer this question

Mathematics
1 answer:
avanturin [10]3 years ago
3 0
We have such system of eq
\left \{ {{9x-2y=19} \atop {7x=21}} \right.
First lets solve second eq
7x=21   /:7   divide both sides by 7
x=3
Now we can substitute it to first equation
9x-2y=19
9*3-2y=19
27-2y=19    /-27 subtract 27 both sides
-2y=-8     /:(-2)  divide both sides by -2
y=4 - its the answer

You might be interested in
2.5% of a population are infected with a certain disease. There is a test for the disease, however the test is not completely ac
Aleks04 [339]

Answer:

P(disease/positivetest) = 0.36116

Step-by-step explanation:

This is a conditional probability exercise.

Let's name the events :

I : ''A person is infected''

NI : ''A person is not infected''

PT : ''The test is positive''

NT : ''The test is negative''

The conditional probability equation is :

Given two events A and B :

P(A/B) = P(A ∩ B) / P(B)

P(B) >0

P(A/B) is the probability of the event A given that the event B happened

P(A ∩ B) is the probability of the event (A ∩ B)

(A ∩ B) is the event where A and B happened at the same time

In the exercise :

P(I)=0.025

P(NI)= 1-P(I)=1-0.025=0.975\\P(NI)=0.975

P(PT/I)=0.904\\P(PT/NI)=0.041

We are looking for P(I/PT) :

P(I/PT)=P(I∩ PT)/ P(PT)

P(PT/I)=0.904

P(PT/I)=P(PT∩ I)/P(I)

0.904=P(PT∩ I)/0.025

P(PT∩ I)=0.904 x 0.025

P(PT∩ I) = 0.0226

P(PT/NI)=0.041

P(PT/NI)=P(PT∩ NI)/P(NI)

0.041=P(PT∩ NI)/0.975

P(PT∩ NI) = 0.041 x 0.975

P(PT∩ NI) = 0.039975

P(PT) = P(PT∩ I)+P(PT∩ NI)

P(PT)= 0.0226 + 0.039975

P(PT) = 0.062575

P(I/PT) = P(PT∩I)/P(PT)

P(I/PT)=\frac{0.0226}{0.062575} \\P(I/PT)=0.36116

8 0
3 years ago
I"LL GIVE YOU BRAINLIEST JUST HELP ME! PLEASE
oee [108]

Answer:

4m^(4)−3m^(3)−6m^(2)+5m      

Step-by-step explanation:

4 0
3 years ago
Liam filled each of 5 buckets with 3.5 liters of water. How much water did Liam use to fill all 5 buckets
Elodia [21]

Answer:

All we do is do 3.5 x 5 to get 17.5 water!

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
There are two major tests of readiness for college, the act and the sat. act scores are reported on a scale from 1 to 36. the di
ch4aika [34]
Standardized z score for the act result  =  (30 - 21.5) / 5.4  = 1.574

so for the sat ressult we have 1.574 = (X - 1498) / 316

X  = 316 * 1.574 + 1498  =  1995  answer
4 0
3 years ago
Find the transformations from y=x^2 for the following equation: f(x)=(x+4)^2 -9
Masteriza [31]
Y=x^2 moves right 4, down 9.
5 0
3 years ago
Other questions:
  • Can someone answer this question, and give me the work?
    12·1 answer
  • What is the surface area?
    7·1 answer
  • Judy is pulling on a trunk with a 12-N force. Ike pulls at right angles to Judy. With how much force must Ike pull to make the r
    9·1 answer
  • Find the slope between (-3,1) and (-17,2)
    15·1 answer
  • A taxi cab in myrtle beach charges $2 per mile and $1 for every person. If a taxi cab ride for two people costs $12, how far did
    7·1 answer
  • Anna is in a cave 37 feet below the cave entrance. She descends 17 feet, then
    6·1 answer
  • Which expression has the greatest value when n is equal to 4? A. 5n B. n + 30 C. 50 – n D. 80 ÷ n
    15·1 answer
  • Miguel has $20 to spend on going to a movie. If he spends $7.25 on a move ticket, $3.95 for snacks, and $1.75 for bus fare, how
    11·1 answer
  • Nisha and Lee Nguyen are purchasing a new home with monthly mortgage payments of $740.16. Their annual property taxes are estima
    7·1 answer
  • A vertical number line is given.
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!