Question

pls help this .... I'll give 5 tqs ​

Answer 1

Answer:

3x+5y=9-----(1)

5x+3y=7-----(2)

multiplying eq(1) by 5 & eq(2) by 3 we get

15x+25y=45

-15x ± 9y= - 21

_____________

     16y=24

y=1624=23

[y=23] and  x=39−5x23=2−1

Hence[x=21]& [y=23]

so x+y=21+23=2

Answer 2

Answer:

Two equations are given as below:

3x + 5y = 9 …Eq. 1

5x + 3y = 7 …Eq..2

In order to solve, multiplying Eq…1 with 5 and Eq..2 with 3

15x + 25y = 45

15x = 45 - 25y…Eq..3

Now substituting value of 15x from Eq..3 to Eq..4 as following

15x + 9y = 21…Eq…4

45 - 25y + 9y = 21

—16y = 21 - 45

--16y = —24

y = 24/16

y = 3/2

Substituting the value of y in Eq..1

3x + 5 (3/2) = 9

3x + 15/2 = 9

3x = 9 – 15/2

3x = (18 - 15)/2

3x = 3/2

x = 3/2 × 1/3

x =1/2

Now calculating the value of x + y

x + y = 3/2 + 1/2

x + y = 4/2

x + y = 2

Answer the value of x + y is 2

Step-by-step explanation:

3x+5y=9 …(1)

5x+3y=7 …(2)

Let us simplify the equations by eliminating a variable

Make the coefficients of X or Y equal

Multiply equation (1) with 5 and equation (2) with 3

We get 15x+25y=45 and 15x+9y=21

Now subtract the equations, we get

(15x+25y)-(15x+9y)=(45–21)

16y=24, y= 24/16 = 3/2

Substituting the value of y in equation (1) we get

3x+5(3/2)=9

3x+15/2=9

3x=9–15/2

3x=3/2

x =1/2

x+y =3/2+1/2= 2

x+y=2

The other method is simply add equations (1) & (2)

You get

8x+8y=16

x+y=2