Question

if 20x + 10y =49, 10x + 20y =41 the find x+y​

Answer 1

Answer:

x+y = 3

PLEASE BRAINLIEST MY ANSWER

Step-by-step explanation:

Give simultaneous equations are-

20x + 10y =49 ------------  1)

10x + 20y =41 ------------- 2)

add equation 1) and 2)

(20x + 10y =49) + (10x + 20y =41)

∴ (20+10)x + (10+20)y = (49+41)

∴ 30x + 30y = 90

∴ 30(x+y) = 90

∴ x+y = 90/30

∴ x+y = 3

I HOPE THIS IS HELPFULL FOR YOU

Answer 2

Step-by-step explanation:

20x + 10y = 49...........1

10x + 20y = 41............2

adding 1 and 2, we get,

30x + 30y = 90

dividing throughout by 30,

we get,

x + y = 3