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Answers
Answer:
Step-by-step explanation:
Answer.
Given units digit is x and tens digit is y
Hence the two digit number = 10y + x
Number obtained by reversing the digits = 10x + y
Given that sum of a two digit number and the number obtained by reversing the order of its digits is 121.
Hence (10y + x) + (10x + y) = 121
⇒ 11x + 11y = 121
∴ x + y = 11
Thus the required linear equation is x + y = 11.
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Answer:
Step-by-step explanation:
Let,
Tens digit be x.
And unit digit be y.
So,number be 10x+y.
No. Obtain by reversing be 10y+x.
A.T.Q
10x+y+10y+x=121
11x+11y=121
11(x+y)=11×11
x+y=11...eqn 1.
From next part of question.
y=x+7
x-y=-7.....eqn 2
From eqn 1+eqn 2
x+y+x-y=11-7
2x=4.
x=2.
Putting x=2 in eqn 1.
x+y=11.
2+y=11
y=11-2.
y=9.
So, no.(10x+y) =10×2+9=29.
Hence, no. be 29.