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stiv31 [10]
3 years ago
15

1. John’s age is three times that of his sister. When you add John’s age to his sister's age, you get 36. How old are John and h

is sister?
(a) Write an equation that represents the situation. (1 point)
(b) Solve the equation from Part (a). Show your work. (3 points)

Answer:
Part A: Write an equation.
If the present age is y, then n times the present age = ny.
If the present age is x, then age n years later/hence = x + n.
If the present age is x, then age n years ago = x – n.
The ages in a ratio a: b will be ax and bx.


Part B: Solve the equation.

John’s age =


John’s sister’s age =
Mathematics
2 answers:
Tems11 [23]3 years ago
8 0

Answer:

36-x=y

y*3=x

x+y=36

Step-by-step explanation:

I wasnt really sure how to write the equation the way you're supposesd to?

John is 27 and his sister is 9. 9*3=27

<em>I just used guess and check sorry</em>

iren [92.7K]3 years ago
6 0

Answer:

sister = 6 years

John=18 years

Step-by-step explanation:

A(S) + 12 = 3 * A(S), subtracting A(S) from both sides one gets 12 = 2 * A(S). Now dividing both sides by 2 we get A(S) = 12/2 = 6 . Therefore, the age of the sister is 6 years when her brother John is three times as old, that is 18 years.

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Answer:

In the elimination method you either add or subtract the equations to get an equation in one variable. When the coefficients of one variable are opposites you add the equations to eliminate a variable and when the coefficients of one variable are equal you subtract the equations to eliminate a variable.

Hope this helps!

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6 0
3 years ago
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At CVS, the tax paid was $2.45, which was 7% of the cost. What was the cost of the items purch
UNO [17]

'Percentage' is obtained by multiplying 2.45 by - 7%.

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<h2>How do we check the result?</h2>

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8 0
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HELP WITH BOTH PARTSSSSSSSSS
const2013 [10]

Answer:

Wait... that's my name... whatever, here is the answer XD

Step-by-step explanation:

c+9.75=20.75 is the answer :D

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Step-by-step explanation:

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