Question

3..(i) समीकरण 2x -3y =13 तथा 7x-2y = 20 को हल कीजिए
और y =m.x + 7 के लिए m का मान ज्ञात कीजिए।​

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

2x-3y=13

7x-2y =20

multiple eq1 by 7 and eq2 by 2

14x-21y= 91

14x-4y=40

by subtracting

14x - 21y =91

14x -4y = 40

- +. - (sign change

we get-17y = 51

y =51/-17=-3

2x-3y=13

2x-3×(-3)=13

2x+9=13

2x = 4

x =2

y = mx+7

-3 = m×2+7

-3-7=2m

-10 = 2m

m=-5

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