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
ss7ja [257]
3 years ago
7

The sum of the digits of a two digit number is 9 When the digits are reversed the number increases by 9. Find the number.

Mathematics
1 answer:
Jet001 [13]3 years ago
6 0

Answer:45

Step-by-step explanation:

Let the unit place be ‘x'

Tenth place be y

The number is 10y+x

x+y = 9 (according to the condition) (1)

Digits are interchanged Unit place' y ‘& tenth place ‘ x'

New no is 10x +y

This is 9 more than the original number

10x+ y = 10y+x +9

10x-x+y-10y = 9

9x-9y= 9

x-y = 1 (dividing by 9) (2)

Adding the two equations

2x = 10

x= 5

Substituting the value of x in first equation

y = 4

The number is 45, the original number is 54 this is 9 more of the new number.

Ans :45

You might be interested in
If x = –3 is the only x-intercept of the graph of a quadratic equation, which statement best describes the discriminant of the e
natita [175]

Equations don't really have x intercepts, functions or curves do. They're also known as the zeros of the function.  When we set a function equal to zero we get an equation to solve, and the zeros of the function become the solutions or roots of the equation.

If a quadratic equation only has one root, that's a repeated root corresponding to a discriminant of zero.

In this example our equation is something like 2(x+3)^2=0, or expanded

2x^2+12x + 18 = 0

The discriminant d=b^2-4ac here is

d = 12^2 - 4(2)(18) = 0 \quad\checkmark


7 0
3 years ago
Need some help with math! See screenshot below.
liq [111]

The answer is A.

40 degrees celsius  to Fahrenheit is 104 degrees fahrenheit.

Please mark brainliest.

6 0
3 years ago
Factor the following equation to find its zeros. y = x² - 36
alukav5142 [94]

Answer:

x = 6, x = - 6

Step-by-step explanation:

Given

y = x² - 36

To find the zeros let y = 0, that is

x² - 36 = 0 ← x² - 36 is a difference of squares and factors in general as

a² - b² = (a - b)(a + b), thus

x² - 36 = 0

x² - 6² = 0

(x - 6)(x + 6) = 0 ← in factored form

Equate each factor to zero and solve for x

x - 6 = 0 ⇒ x = 6

x + 6 = 0 ⇒ x = - 6

3 0
3 years ago
Find the value of x that makes the triangle a right triangle.
gogolik [260]

Answer:

Hi, I don't see an attachment with your question. But without any attachments to refer to. You use Pyrhagoras Theorem to solve this question.

Step-by-step explanation:

A^2 (Short side) + B^2 (Short side) = C^2 (Long side)

Stay safe and Merry Christmas! :)

4 0
2 years ago
5.Last Sunday, 4 of the houses had some cars parked outside. If there
LUCKY_DIMON [66]
16 because it’s basic multiplication
5 0
3 years ago
Other questions:
  • What is the slope of the line that passes through (0,12) and (3,9)
    6·2 answers
  • Chris plants 40 pumpkin seeds in five equal how many seats does Chris Plant in each row? Make an array to represent the problem?
    5·1 answer
  • 4 (2/3) is the same as 4 groups of (2/3).
    11·1 answer
  • Which of the following expressions is equivalent to y^-3?
    11·1 answer
  • PLEASE HELP!! WILL GIVE BRAINIEST!!​
    10·1 answer
  • I need help on these 9 questions!!!!
    9·1 answer
  • Which coordinate pair identifies a point in the third quadrant of the coordinate plane?
    8·1 answer
  • Can anyone help me?<br><br> I'm having lot's of trouble.
    10·1 answer
  • Decide which is the better value based on the unit prices. ( show your work).
    8·1 answer
  • PLEASE HELP i need it !!!!!
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!