1) " The cost of a notebook is four times cost of a pencil " . Write a linear equation in two variables to represent this statement .

2) " The cost of a book is three times the cost of a pen " . Write a linear equation in two variables to represent the statement.

3) " The cost of a notebook in twice the cost of a pen" . Write a linear equation in two variables to represent this statement . Also state whether for any solutions of this equation can x or y take negative values ?

4) Write the linear equations in two variables in the form ax + by + c = 0 by using the given values of a , b , c.

 a)  a = 0 , b = -3 , c = 0                       b)  a = 1/2 , b = -1/3  and  c= 1/6

4)

Your friends have correctly answered the question. Good effort!! Keep posting.

Solution of (4) can be further simplified. The equations formed will be:

(a) –3y = 0 ⇒ y =0

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1)let the cost of notebook be y,let the cost of pencil be x.therefore the answer is y=4x

2)let the cost of book be y,the cost of pen be x.therefore the answer is y=3x

3)let the cost of notebook be y,the cost of pen be x.therefore the answer is y=2x.no,because money cannot be in negative value.

4)i cant understand this question

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ans1) let take cost of a notebook to be x

  and cost of pencil to be y.

  cost of notebook is 4 times the cost of a pencil.

  so, x=4y

ans2) let the cost of book=x

and cost of pen=y

x=3y.

ans3) let cost of a notebook to be x

and cost of pen=y

x=2y.

no.

as money cannot be taken in negative value.

ans4) a)-  0.x + -3(y) + 0 =0

  b)-  12(x) + -13(y) + 16 = 0.

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