Question

answer this one please
all of this
brilliant please answer

Answer 1

10x+y+10y+x=66
11x+11y=66
x+y=6------1)

x-y=2--------2)

Adding 1) and 2), we get

2x=8
x=4

x+y=6
4+y=6
y=2

Answer 2

Heya !!

Here's your answer ..
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Q. 9

Ans.

$\frac{1}{2x} - \frac{1}{2y} = - 2 \: \: and \: \: \frac{1}{x} - \frac{1}{2y} = 1 \\ \\ let \: \: take \: \: \frac{1}{x} = a \: \: and \: \: \frac{1}{y} = b \\ \\ a - b = - 4 \: \: \: ........(1) \\ 2a - b = 1 \: \: \: ..........(2) \\ \\ subtract \: \: eq.(2) \: \: from \: \: eq.(1)$

a - b = -4
-2a +b = - 1
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- a = - 5
a = 5

put the value of ( a) in eq. (1)...,

5 - b = - 4
- b = -4 -5
-b = -9

b = 9

1/x = a = 5
1/y = b = 9

x = 1/5
y = 1/9
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Q. 10

Ans.

Let Ten's place = x

Unit place = y

original no. = 10x + y

No. obtain by reversing it = 10y + x

Given that sum of two digits and no. obtain by reversing it is 66.

10x + y + 10y + x = 66
11x + 11y = 66

11 ( x + y ) = 66
x + y = 6 ......(3)


Now given the digits of a no. differ by 2..,

x - y = 2
x = 2 + y ......... (4)

put value of x in eq. (3)

2 + y + y = 6

2y = 6 - 2
y = 4/2
y = 2

put value of (y) in eq (4)..,

x = 2 + 2
x = 4

original no. = 10x + y
= 10(4) + 2
= 40+2
= 42
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Hope it helps..
Thanks :)