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
Law Incorporation [45]
2 years ago
15

Find the value of two numbers if their sum is 21 and their difference is 5

Mathematics
1 answer:
kykrilka [37]2 years ago
6 0

Answer: x = 13 and y = 8

Step-by-step explanation:

Two numbers must add to 21. We don't know them yet, so let's just use a placeholder for both of them for now.

x + y = 21

Their difference is five, meaning that if we subtract one from the other, we get five. Again, we don't know the numbers yet, so we'll add a placeholder for now.

x - y = 5

We can now solve a system of equations for x.

x = y + 5

y + 5 + y = 21

2y + 5 = 21

2y = 16

y = 8

x - 8 = 5

x = 13

So x = 13 and y = 8

You might be interested in
Donald's car gets about 30 miles per gallon. About how many miles can Donald drive on 9.2 gallons of gas? At $3.15 a gallon, abo
denis-greek [22]
<span>30x9.2= 276 miles 9.2x3.15=$28.98 So the car can drive 276 miles if you put $28.98 of gas in it.</span>
8 0
2 years ago
Pls help me out on this ill will give brainiest for the best answer
Svetach [21]

Answer:

Step-by-step explanation:

butt

7 0
2 years ago
So say selling a backpack thats used-like new and the original price is $54.00 how much should I set the price at??
Nat2105 [25]

it most be eleven hundred

6 0
3 years ago
Read 2 more answers
What is the solution of the system? Use substitution. x - y = -6 6x - 3y = -9
elena-14-01-66 [18.8K]

Answer:1.5,-1.5

Step-by-step explanation:

I just answered it

3 0
2 years ago
It costs $4to enter the fair.each ride costs 42.50.you have $21.50.how many rides can you go on
e-lub [12.9K]
0 if the price of each ride is 42.50 you only have enough to get admission into the fair.
7 0
2 years ago
Other questions:
  • How would I start to solve number 15? Would I use distributive property?
    13·1 answer
  • A rectangular pool has dimensions of 40 ft. and 60 ft. The pool has a patio area around it that is the same width on all sides.I
    7·2 answers
  • In the decimal number .675, the 7 holds what place value? 
    13·2 answers
  • Jeremy plays basketball. He scored a total of 1489 points consisting of 2-point and 3-point baskets. If he made 640 baskets, how
    12·1 answer
  • Lacy wants to paint her bedroom walls she has to cover 1,162.5 ft.² about how many gallons of paint will she need
    5·1 answer
  • Real world example of parallel lines
    7·2 answers
  • √7-x+5=x help please
    12·1 answer
  • Help me please this is so hard
    11·1 answer
  • Factorise 12x cubed - 9x squared
    9·1 answer
  • Questions in the picture!<br><br> Can I have the answer to2 decimal place<br><br> __.__cm2
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!