Question

find x and y

3х+ 4y = 10

4 х - 8 y=20​

Answer 1

Answer:

Here goes the solution!

( 3x + 4y = 10 ) × 2 --------------( i )

4x - 8y = 20 --------------( ii )

After multiplication,

6x + 8y = 20 --------------( iii )

4x - 8y = 20 --------------( iv )

___________ by addition

10x = 40

x = 4

Substituting value in eq. ( i )

3x + 4y = 10

3 × 4 + 4y = 10

4y = 10 - 12

y = -2/4

y = -1/2