Form the pair of linear equations in the following problems, and find their solutions graphically.
(i) 10 students of Class X took part in a Mathematics quiz. If the number of girls is 4 more than the number of boys, find the number of boys and girls who took part in the quiz.
(ii) 5 pencils and 7 pens together cost ` 50, whereas 7 pencils and 5 pens together cost ` 46. Find the cost of one pencil and that of one pen

NCERT Class X
Mathematics - Mathematics

Chapter _PAIR OF LINEAR EQUATIONS
IN TWO VARIABLES

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Answers

2015-06-12T14:41:14+05:30
1.Let no.of boys be x
no.of girls=x+4
total no. of students=10
x+x+4=10
2x+4=10
2x=10-4
2x=6
x=6/2
x=3
no.of boys=3
no.of girls=3+4=7
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