Question

if 3 upon x + 4 upon y = 18 , 5 upon x + 6 upon y equals 28 then x minus y =
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Answer 1

Answer:

Education

(i) 1 and x + 3 5 y +3 6 E. 6x –59 + 3 = 0 ...(ii) 1 On comparing with equation ax + by + c = 0. we get a1 = 11, b = -9, c1 = 4, and a2 = 6, ...

Answer 2

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Given: 3/x+4/y=18,5/x+6/y=28

To find: x+y

Sol: Let 1/x be a and 1/y be b

Therefore 3a+4b=18............(1)

And 5a+6b=28.............(2)

From(1), a=18-4b/3........(3)

Putting a in (2), we get

5(18-4b/3) +6b=28

(90-20b/3) +6b=28

90-20b+18b=28b

90-2b=28b

90-30b=0

90=30b

b=3

Putting b=3 in (3)

a=18-12/3

a=6/3

a=2

Now,1/x=a

1/x=2

x=1/2

Also, 1/y=b

1/y=3

y=1/3

Therefore, x+y=1/2+1/3

x+y=3+2/6

x+y=5/6