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A number consists of two digits whose su...

A number consists of two digits whose sum is 8 if 18 is added to the number its digits are reversed find the number

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Let the ten's digits be x and unit's digit be y . Then,
` x + y = 10 " " `… (i) and `(10x + y ) - 18 = (10 y + x ) rArr x - y = 2 . " "`… (ii)
Solve (i) and (ii).
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RS AGGARWAL-LINEAR EQUATIONS IN TWO VARIABLES -Exercise 3F
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  4. Write the number of solutions of the following pair of linear equat...

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  12. Solve the following system of equations: 2/x+3/y=9/(x y),\ \ \ 4/x+...

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  13. If (x)/(4) + ( y)/(3) = (5)/(12) and (x)/(2) + y = 1 then ...

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  14. If 12 x + 17 y = 53 and 17 x + 12 y = 63 then find t...

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  15. Find the value of k for which the system of equations 3x + ...

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  18. Show that the system 2 x + 3y - 1 = 0 , 4x + 6y - 4 = 0 has no ...

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