Question

1. For the pair of linear equations in the following problems, and find their solutions
graphically
) 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
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.​

Answer 1

Answer:

girls: 7

boys: 3

Step-by-step explanation:

let the number of boys be x.

therefore, the number of girls would be x + 4

x + (x + 4) = 10

2x + 4 = 10

2x = 10 - 4

6

x = 6 ÷ 2

3

no. of boys - x = 3

no. of girls - x + 4

3 + 4

7

Answer of the first question.

Hope it's correct.