if 7 is added with the sum of digits of a number of two digits, the summation will be thrice the digit of ten place. But, if we substract 18 from the number, the digits change the position.
a) form two equation if the digit of one place and ten place are x and y respectively
b) determine the number.
c) solve the equation with the help of graph
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not enough time to ans . ur Q .
sorry
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