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
xxTIMURxx [149]
2 years ago
15

Solve: x+y=5 x-4y=20

Mathematics
1 answer:
WARRIOR [948]2 years ago
6 0

Answer:

x=8

y=-3

Step-by-step explanation:

let

x+y=5........ equation 1

x-4y=20....... equation 2

x=20+4y

substituting the value of x in eq 1

x+y=5

20+4y+y=5

5y=5-20

y=-15/5

y=-3

again putting the value of y in eq 2

x=20+4y

x=20+4(-3)

x=20-12

x=8

You might be interested in
Which is not equivalent to the rest 13/20 66% 195/300 0.6500
Ganezh [65]
Hey there! :)

Let's change all the fractions and percents to decimal.
_____________________________________________________________

When changing fractions to decimal, divide the numerator by the denominator
When changing percents to decimal, remove the % sign and move the decimal to places to the left.
_____________________________________________________________

13 ÷ 20 = 0.65
66% = 0.66
195 ÷ 300 = 0.65
0.6500 = 0.65
_____________________________________________________________

The answer is 66% because it is the only one that isn't equivalent to 0.65

Hope this helps :)
8 0
3 years ago
What value should be added to the expression to create a perfect square?
Lilit [14]
Answer is D.Don't take out the square

8 0
4 years ago
Can anyone help me with this please
Vikentia [17]

Answer:

1. 3

2. 1

3. 9

4. 30

Step-by-step explanation:

1. 2*(18/12) = 3

2. 3*(5/15) = 1

3. 4*(45/20) = 9

4. 21*(10/7) = 30

4 0
2 years ago
Read 2 more answers
The simple interest on an investment of $8000 for one year is $360.
elena55 [62]
I = PRT
$360 = $8000 x R X 1
$360 = $8000 X R
$360/$8000 X R /$8000
0.045 = R
R= 0.045 * 100
R = 4.5%
8 0
4 years ago
Multiply and simplify
emmasim [6.3K]

Answer:

B

Step-by-step explanation:

It's easy:

\frac{4}{16}* \frac{y^5}{y^2}

\frac{y^3}{4}

So, the answer is B.

8 0
3 years ago
Other questions:
  • The expression 7 + 2(x – 3) + 5x is simplified correctly in the correct order. Which of the steps has an incorrect justification
    9·2 answers
  • You are a landscaper and need to mulch 15 yards of plant beds. You have 20 bags of mulch and each bag covers 3 feet.How many bag
    6·1 answer
  • What percent is $6.00
    8·1 answer
  • Help please with the question
    11·1 answer
  • What is 4/5 of 1/4 of 40
    10·2 answers
  • If ( 5^w )( 5^x ) = 5^y / 5^z , what is z in terms of w, x and y?
    11·1 answer
  • Two parallel lines, p and q, are cut by the transversal k as shown.
    6·1 answer
  • PLEASE PROVIDE REASONING AND SHOW WORK TO
    13·1 answer
  • jamal plans to save for a new scooter that costs 48 dollars. the sales tax rate is 5% how much will jamal need to save
    11·1 answer
  • Tom swam to the bottom of a swimming pool that was 9 feet deep and he touched the
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!