Question

is 3 X + 5 Y is equal to 9 and 5 x + 3 Y is equal to 17 find the value of x + Y
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Answer 1

Answer:

Step-by-step explanation:

3x +5y =9.....(1)

5x+3y=17........(2)multiplying (1) with5 and (2) with 3

So,

15x+25y=45....(3)

15x+9y = 51.....(4)

(3)-(4)

16y=-6

y=-6/16=-3/8

Substituting y value in (1),

3x+5x-3/8=9

3x=9+15 /8

X=29/8

Now, x+y = 29/8+(-3/8)=29-3/8=26/8=13/4

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Answer 2

Hey mate, here is your answer :-

x + y = 2

Step - by - step explanation :-

$3x + 5y = 9 \: \: ....(1)\\ 5x + 3y = 7 \: \: \: ....(2) \\ \\ 8x + 8y = 16 \: \: ....(adding \: equations \: (1) \: and \: (2)) \\ x + y = 2 \: \: ...(dividing \: both \: sides \: by \: 8)$

Hope it helps.

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NOTE :- ( There should be second equation as

5x + 3y = 7 as I have taken.)