the electricity consumption of a family in Delhi for a month is 230 units . Taking amount of bill as Rs x and consumption above 200 units as y , make a linear equation  in two variables . also find the amount of bill from it .(pk 9th class , pg 27 , question 14)

x = y +30 Now put the any value of y like 0,1,2,3 and the x will get
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The answer is not logical and clear.....plz pay attention to this question and alswer......i m also look8ng for an answer to this question
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Amount of bill = consumption of electricity X = y + 30 X - y -30
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