Question

your answer very useful to me please give me answers ​

Answer 1

Answer:

Option c

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Step-by-step explanation:

5x+7y= 17

7x+5y=19

5x+7y= 17 multiply by 5

7x+5y=19 multiply by 7

25x+35y= 85

49x+35y= 133

by Subtract:

25x - 49x = -24x

35x - 35x =0

85-133 = -48

Well

-24x = - 48

x = -48/-24

x = 2

put x value to solve y

7x+5y=19

7(2)+5y=19

14 + 5y = 19

5y= 19-14

y = 5/5

y = 1

Well x= 2 and y = 1

So x +y = 2+1 = 3

Option c is the correct answer

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Answer 2

answer= (c) 3

by elimination method

5x+7y=17 --1

7x+5y=19 --2

multiply eq 1 with 7 and eq 2 with 5

we get,

35x+49y=119 --3

35x+25y=95 --4

subtract eq 4 from 3

35x+49y=119

-35x-25y=-95

___________

0+24y=24

___________

y=24/24

y=1

now put y =1 in eq 1

5x+7×1=17

5x=17-7

x= 10/5

x = 2

now,

x+y

= 1+2

= 3

hope this help you