EXERCISE 3.2
1. Form the pair of linear equations in the following problems, and find their solutions
graphically
(0) 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
(m) 5 penils and 7 pens together cost 750, whereas 7 pencils and 5 pens together
Cut 40. Find the cost of one pencil and that of one pen.
and find out whether the lines
representing the
2. On comparing the ratios
Answers
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1
Answer:
(0) number of boys=3
number of girls=7
Step-by-step explanation:
let the number of boys be X
so number of girls=X+4
now it is given that total students were 10 so,
X+(X+4)=10
2X+4=10
2X=10-4=6
X=6/2=3
so number of boys =3
number of girls=X+4
=3+4
=7
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