Question

10x - 4y = 80
10y - 9x = -40​

Answer 1

Answer:

x=10 and y=5

Step-by-step explanation:

Answer 2

Step-by-step explanation:

We have,

$\sf{10x -4y=80 \:\: ........(1)}$

$\sf{-9x+10y=-40 \:\: ........(2)}$

Multiplying eqn (1) by 9 and eqn (2) by 10 and then adding (1) and (2) we get,

90x -36y = 720

-90x+100y = -400

————––––––—

64y = -320

=>y = -320/64

=>y = -5

Substituting y = -5 in eqn (1), we get,

10x - 4(-5) = 80

=> 10x + 20 = 80

=> 10x = 80 - 20

=> x = 60/10 = 6

Hence,

x = 6

and y = -5

Hope if helps ❣️❣️❣️