Question

3х – 4y = 7
5x +2y = 3 find the value of 7x+ 5y.​

Answer 1

Answer:

x=1 & y=-1

7x+5y=2

Step-by-step explanation:

3x-4y=7

5x+2y=3-------×2

3x-4y=7

10x+4y=6.

On adding

13x=13

x=1

Putting value in equation

3(1)-4y=7

3-4y=7

-4y=4

y=-1

Now, Value of 7x+5y=7(1)+5(-1)

7-5=2

Answer 2

Step-by-step explanation:

$\huge\underline\mathfrak{Answer}$

3x - 4y = 7-------------(1)

5x + 2y = 3------------(2)

Multiply equation 2 with 2

2(5x + 2y = 3)

=> 10x + 4y = 6------------(3)

adding eqn(1) and (3)

3x - 4y = 7

10x + 4y = 6

------------------

13x = 13

x = 13/13

x = 1

Put x=1 in equation 1

3(1) - 4y = 7

3 - 4y = 7

- 4y = 4

y = -4/4

y = -1

7x + 5y = 7(1) + 5(-1)

= 7 -5

= 2

HOPE IT HELPS....