Question

10 students of class 10 took part in mathematical quiz if number of girls for more than number of boys find the number of boys and girls took part in the quiz( do not use graphical method to solve this use cross multiplication Or substitution method or elimination method ​

Answer 1

Answer:

Step-by-step explanation:

number of boys be x.

Number of girls be y.

Given that total number of student is 10 so that

x+y=10

Subtract y both side we get

x=10–y

Plug y=0,5,10 we get

x=10–0=10

x=10–5=5

x=10–10=0

Therefore, the required points are (0,10),(5,5),(10,0).

Given that If the number of girls is 4 more than the number of boys

So that

y=x+4

Plug x=−4,0,4, and we get

y=−4+4=0

y=0+4=4

y=4+4=8

Therefore, the required points are (−4,0),(0,4),(4,8).

The graph is as shown above:

Since the point of intersection in the above graph is (3,7),

Hence, the number of boys are 3 and the number of girls are 7.

solution

Answer 2

Answer:

girls are 7

boys are 3

Step-by-step explanation:

Let's no of girls be - y

let the no of boys be - x

so, ATQ

x + y = 10 ---- 1

and y= x + 4 ----2

so, From 1,2

x + x + 4 = 10

then, x=3 ----3

from 1,3

y = 7

Thanks mark me