Question

problem.
501
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EXERCISE 3.2
1. Form the pair of linear equations in the following problems, and find their solutions
graphically.
(1) 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
(0) 5 pencils and 7 pens together cost 350, whereas 7 pencils and 5 pens together
cost 46. Find the cost of one pencil and that of one pen.​

Answer 1

Answer:

8,954,3

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Answer 2

Answer:

Hey, your answer for the first one is boys = 3 and girls = 7.

Step-by-step explanation:

Step 1- let the no. of boys be y.

step 2- no. of girls = y+4

step 3- total no. of students = 10

step 4- equation formed = y+y+4=10

step 5- solving the equation= y+y+4=10

2y+4=10

2y = 10 - 4

2y=6

y=6÷2

y=3

step 6- no. of boys is 3

no. of girls = 3 + 4 = 7.

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