EXERCISE 3.2
Form the pair of linear equations in the following problems, and find th
graphically.
(1) 10 students of Class X took part in a Mathematics quiz. If the numbe
more than the number of boys, find the number of boys and girls wh
the quiz.
i 5 pencils and 7 pens together cost Rs 50, whereas 7 pencils and 5 p
cost Rs 46. Find the cost of one pencil and that of one pen.
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Answer:
cost of pencil=x
cost of pen=y
5pencils and 7 pens cost=50
5x+7y= 50
7pencils =x
5pens=y
7pencils and 5pens cost=46
7x+5y=46
Explanation:
5x+7y=50 ×2= 10x+14y=100
7x+5y=46 ×2= 14×+10u=92
-4×+4y=18
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