Question

4x + 5y = 12 and 5x + 4y = 6 then find the value of x + y​

Answer 1

Answer:

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Answer 2

Step-by-step explanation:

4x+5y=12

x=12-5y/4

x= 3 - 5y/4

5x+4y=6

5(3- 5y/4) +4y=6

15 -25y/4 +4y =6

-25y +16y/4 = 6-15

-9y/4 =-9

y=4

4x+5y=12( substitute y =4 and find x)

x=-2