3x + 4y = 7, 8x + 5y = 12. The value of x and y is 13, 20
20, 13
13/17, 20/17
20/17, 13/17

13/17, 20/17

Step-by-step explanation:

3x + 4y = 7 --- Equation 1

Equation 1×5:

15x + 20y = 35 --- Equation 2

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

8x + 5y = 12 --- Equation 3

Equation 3×4:

32x + 20y = 48 --- Equation 4

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

Equations 4-2:

32x + 20y - 15x - 20y = 48 - 35

17x = 13

x =

Substitute x = into Equation 1:

3x + 4y = 7

3() + 4y = 7

+ 4y = 7

4y = 7 -

    = -

    =

y =   ÷ 4

y =

Thus, x = , y = .

( , )

5050

hope this !