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Maths x+y=25 4x+5y=56 solve for x and y

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X=25-y
4(25-y) + 5y=56
100-4y+5y=56
100+y=56
y= -44
x=25+44=69

x=69 y= -44

Posted on Aug 22, 2008

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1 Answer

Whats thr re-writeing equation of 20=x-5y


solution is:

x-5y = 20
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How do i divide 56 divded by 7


Multiply 7 x 8 to give 56. !
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8x + 3y = 3 4x + 5y = -23


This is best written as two separate equations:

8x+3y = -23 and 34x+ 5y = -23
Solving the first one for x:
8x = -23-3y
x = -23/8 - 3/8y
Substituting this value for x into the second equation:
34(-23/8 - 3/8y) + 5y = -23
-97.75 - (34)(.375)y + 5y = -23
-97.75 - 12.75y + 5y = -23
-97.75 -7.75y = -23
-7.75y = 97.75-23=74.75
y = -74.75/7.75 = -9.645161
Substitution back into the equation for x:
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x = -2.875 + 3.616935
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1 Answer

X and y intercepts


First of all you equation is not one : it has nothing on the right side of the = sign. But to answer the general question let us write the equation as 50+25x-5y=0
X-intercept (also know as roots) There may be several
Definition: X-intercepts are those values of the independent variable x for which y=0. For a straight line there con be at most 1 x-intercept.
To find the intercept, set y=0 in the equation of the line and solve for x
50+25x-5(0)=0 or 50+25x=0. The solution is x=-(50/25)=-2

Y-intercept (also know as the initial value. There can only be 1 y-intercept, otherwise the expression does not represent a function.
Definition: It is the value of the dependent variable y when x=0 (where the function crosses the y-axis
To find it, set the x-value to 0 in the equation of the line.
50+25x-5y=0
50+25(0)-5y=0, or 50-5y=0. The solution is y=50/5=10
The straight line cuts the x-axis at the point (-2, 0) and the y-axis at the point (0,10)

Jan 28, 2014 | Computers & Internet

1 Answer

If y=f(x)=5x+3/4x-5 , show that x=f(y)


Write the equality in the form y=(5X+3)/(4X-5). Insert parentheses to ensure a correct result.
  1. Multiply both sides of the equality by (4X-5). This gives (4X-5)y=(5X+3).
  2. Open the parentheses as 4Xy-5y=5X+3
  3. Subtract 5X from both sides 4Xy-5y-5X=5X-5X+3
  4. Add 5y to both sides 4Xy-5X-5y+5y=5y+3 or 4Xy-5X=5y+3
  5. Factor the X on the left side X(4y-5)=5y+3
  6. If 4y-5 does not vanish, you can isolate X by dividing both members of the equality by (4y-5).
  7. You get X=(5y+3)/(4y-5)=f(y)
Compare the initial function f(x) and the function just found: They have the same form: X and y have switched places.

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2 Answers

Heena has only rs 2 and rs 5 coins,in her purse. if in all she has 80 coins in her purse amounting to rs 232. find the number of rs 5 coin.


Is this a maths school problem?
You need to use algebra -
2x + 5y = 232 (heena has a number of 2 and 5 coins in her purse which add up to 232)
x + y = 80 (heena has x number of 2 and y number of 5 coins which tally to 80)
therefore, x = 80 - y
so going back to first equation, 2(80 - y) + 5y = 232
160 - 2y + 5y = 232
3y = 72
y = 24
and going back to x, x = 80 - y
x = 80 - 24
x = 56
so heena has 56 rs 2, and 24 rs 5. So the answer is 24.

Jan 26, 2011 | Computers & Internet

1 Answer

34122 45200 56300 67428 785630 what is the next line ? explain the pattern


We can solve this problem by taking digit by digit.
First and second digit,both are increased by 1,respectively

34…,45…,56…,67…,78…,89…

Third and fourth are the multiplication of first and second digit
3 x 4 = 12

4 x 5 = 20
5 x 6 = 30
6 x 7 = 42
7 x 8 = 56

8 x 9 = 72
so now the series become
3412.,4520.,5630.,6742.,7856.,8972.

Last digit equivalent multiplying the third and fourth digit:
1 x 2 = 2
2 x 0 = 0
3 x 0 = 0
4 x 2 = 8
5 x 6 = 30

7 x 2 = 14


so now the series become

34122,45200,56300,67428,785630,897214

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1 Answer

Plank of wood 2 metres long. cut into two lenghts. longer piece is four times the lenght of shorter piece. how long is each lenght?


It is solved by writing an equation
If the shorter piece is y cm, then the the longer piece would be 4y which is four times the shorter length. The total of these 2 together is 2meters or 200 cm, Now write the equation (2 pieces together is 200cm)

y + 4y = 200
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y =40
Since we have taken the lengh of shorter piece as y,
Shorter piece=40 cm OR 0.4m
Longer piece =160cm OR 1.6m
I have written the steps in detail for you to understand the process
Good luck
luciana44
Longer piece= 160cm

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1 Answer

Solving matrix


Go to your matrix button and enter a "3x4" matrix.

Then enter it as follows:

-3 4 5 7
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Then exit out and go to "2nd->matrix->math->rref(". Then press enter.

Your screen should look like this:

rref(

Then go to matrix and select your 3x4 matrix, press enter and close it with a parathesis. Your screen should look like this:

rref([A])

Press enter and the screen should say this:

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So,
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Hope this cleared up the confusion!

SJ_Sharks

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Maths Equations


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Jan 17, 2008 | Curtis-Mathis CM25011 25" TV

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