Question

Those ppl who solve the given problems correctly i will mark u as brainliest.

Plz guys I need urgently. DO TRY AT LEAST 2.

Answer 1

Answer:

17 number of girls

Step-by-step explanation:

Answer 2

$\Huge{\underline{\green{\mathfrak{Ans}}{\mathfrak{wer}}}}$

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$\LARGE{\red{\bigstar}} {\underline{\orange{\sf{To \: Find :}}}}$

We have to find the value of k

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$\LARGE{\red{\bigstar}} {\underline{\orange{\sf{Solution :}}}}$

★ Condition for no solution is given below ↓↓↓

$\Large{\star{\boxed{\sf{\frac{a_1}{a_2} = \frac{b_1}{b_2} ≠ \frac{c_1}{c_2}}}}}$

Where,

a1 = 4 , b1 = -k , c1 = 10 , a2 = 1 , b2 = -1 and c2 = 5

_____________[Put Values]

$\sf{\frac{4}{1} = \frac{-k}{-1} ≠ \frac{10}{5}} \\ \\ \sf{→\frac{4}{1} = \frac{\cancel-k}{\cancel-1}} \\ \\ \sf{→4 = k}$

$\large{\star{\boxed{\sf{K = 4}}}}$

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$\LARGE{\red{\bigstar}} {\underline{\orange{\sf{Given :}}}}$

3x - 5y = 19 ........ (1)

7x + 3y = 15 ........ (2)

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$\LARGE{\red{\bigstar}} {\underline{\orange{\sf{To \: Find :}}}}$

We have to find value of x and y using (Elemination method).

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$\LARGE{\red{\bigstar}} {\underline{\orange{\sf{Solution :}}}}$

→ Multiplying equation (1) by 3 and equation (2) by 5.

9x - 15y = 57.....(3)

35x + 15y = 75 .....(4)

We get,

→ 44x = 132

→ x = 132/44

→ x = 3

$\large{\star{\boxed{\sf{x = 3}}}}$

(Putting Value of x in equation 1.)

→3(3) - 5y = 19

→ 9 - 5y = 19

→ -5y = 19 - 9

→ -5y = 10

→ y = 10/-5

→ y = -2

$\large{\star{\boxed{\sf{y = -2}}}}$