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
Virty [35]
3 years ago
14

Can someone explain how to do this please?

Mathematics
1 answer:
Jobisdone [24]3 years ago
4 0

\bf \begin{cases} \boxed{y}=-2x\\\\ -x-y=4 \end{cases} \\\\[-0.35em] ~\dotfill\\\\ \stackrel{\textit{since we know what \boxed{y} is, let's substitute it in the 2nd equation}}{-x-\left( \boxed{-2x} \right)=4\implies -x+2x=4\implies x=4} \\\\[-0.35em] ~\dotfill\\\\ y=-2x\implies y=-2(4)\implies y=-8 \\\\[-0.35em] \rule{34em}{0.25pt}\\\\ ~\hfill (4,-8)~\hfill

You might be interested in
the elephants water tank holds 2560 gallons of water. Afterbtwo weeks the zookeeper measures and finds that the tank has 1944bga
sesenic [268]
2560-1944= 616gallons
7 days in a week or 14 days in two weeks
616gallons / 14days = 44 gallons / 1 day
Notice in the fraction we have
(Gallons / days)
Now if you filled the take up the entire way
2560 gallons
We have gallons and the question wants the amount of days
Thus to cancel gallons we set the equation up as such
(2560 gallons) x (1 day / 44 gallons) = 58.18 days
Or 58 days
6 0
3 years ago
Read 2 more answers
Solve x+y=7 and 3x-2y=11 using elimination
BartSMP [9]
X=5 and y =2.
Here's how you do it.
Multiply the first equation by -3, and the second one by 1.
add the equations to eliminate x.
then solve for y by dividing both sides by -5, which gives us 2.
to solve for x subsitute 2 in for y.

8 0
4 years ago
What is equivalent to 40/64
Nadya [2.5K]

Answer: 5/8


Step-by-step explanation:


8 0
3 years ago
A Cab charges $1.75 for the flat fee and $0.25 for each mile. Write and solve an inequality to determine how many miles Eddies c
NemiM [27]
1.75 + 0.25x ≤ 15
where x is equal the number of miles.

The key to solving an inequality is just temporarily making the ≤ symbol a =. Then solve for x like any other algebraic equation. Once you find the value of x, you will have solved the inequality. Make sure to add back the ≤ when you are done. 

15 - 1.75 = 13.25
13.25/0.25 = x 
x = 53
add back the ≤
x ≤ 53
This means Eddies can travel up to 53 miles with his $15.
4 0
4 years ago
Change 0.275 to a fraction
goldenfox [79]
<span>Well, the number is decimal form, is in the thousandths place, so the denominator, would be 1000's: 
<em><u>0.275 = 275⁄1000</u></em></span><em><u> </u></em>
<span>Then, you have to Simplify 275⁄1000 In which, you would get: <em><u> 11⁄40</u></em></span><span><em><u> </u></em></span>
8 0
3 years ago
Read 2 more answers
Other questions:
  • The product of twice a number and two is the same as the difference of three times the number and 1/2. find the number.
    5·1 answer
  • A cake recipe requires cups of flour to make 1 cake. How many cakes can be made by a baker who has 16 cups of flour?
    13·1 answer
  • A sweater originally costs $36. If the sweater is on sale for $30.24 what is the percent of the discount
    12·2 answers
  • I need help for this math question
    9·1 answer
  • If Event A and Event B are independent, what is the outcome if Event A occurs with a probability of 0.18 and Event B occurs with
    10·1 answer
  • Pls help this is due in an hour!! thank you
    8·1 answer
  • Can u guys answer these last 4 questions for me w/ work shown and also label the ones u guys did so I won’t get them mixed up
    12·1 answer
  • At store A, apples are $3.99 for 5 apples. At store B, apples are $20 for 10 apples. Which is the better deal?​
    12·2 answers
  • What is the surface area of the figure<br><br> 16 cm *2<br> 30 cm *2<br> 48 cm *2
    7·1 answer
  • Can u help me?<br> What is the measure of
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!