Question

solve by elimination mwthod 3x-4y=15 and 2x-2y=18​

Answer 1

Answer:

Step-by-step explanation:

the first equation is 3x-4y=15

the second equation is 2x - 2y =18

(1) x 2 = 6x - 8y =30

(2) x 3 = 6x - 6y = 54

(-)

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

            - 2y = -24

                  y =12

now sub y in (1)

      = 3x - 4 x 12 =15

        = 3x - 36 = 15

        = 3x = 51

       = x = 17          

Answer 2

Answer:

x = 21 and y = 12

Step-by-step explanation:

3x - 4y = 15 __(1)

2x - 2y = 18 __(2)

✴Multiply eq 2 by 2

4x - 4y = 36 __ (3)

✴Subtract eq (1) from (3) :

4x - 4y - 3x + 4y = 36 - 15

✔x = 21

✴Putting x = 21 ineq 2 :

2 x 21 - 2y = 18

42 - 2y = 18

-2y = 18 - 42

- 2y = -24

✔y = 12