Question

the number of solution for pair 3x+4y=12, 4x-3y=18​

Answer 1

Step-by-step explanation:

Answer 2

Answer:

x = 6 , y = 1.5

Step-by-step explanation:

3x+4y=12.........................(1)

4x+3y=18.........................(2)

3 multiple by eqution (1)

3(3x+4y=12)

9x+12y=36......................(3)

4multiple by eqution (2)

4(4x+3y=18)

16x+12y=74.....................(4)

sudstract equation 4 by 3

16x+12y=74

-

9x+12y=36

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

7x = 48

x = 48

----

7

x = 6 ..........................(by instodent)

put x=6 in eqution 1

3x + 4y = 12

3(6) + 4y =12

18 + 4y = 12

4y = 18 - 12

4y = 6

y = 6

----

4

y = 1.5