Math, asked by Vinodshrma67vs12, 5 months ago

if 3x +4y =7 and 10x-y=9,then find the value of 2x+3y.​

Answers

Answered by chinmaya44
10

Step-by-step explanation:

3x+4y=7-----------(1)

10x-y=9-------------(2)

(1)×10=30x+40y=70

(2)×3 =30x -3y=27

(-) (+) (-)

-------------------------------

43y=43

y =1

putting the value of y in equation (1) we can get

3x+4y=7

=>3x+4×1=7

=> 3x+4=7

=>3x=3

=> x=1

2x+3y=2×1+3×1=2+3=5

Answered by Anonymous
5

Answer:

Given equation is 3x+4y=7

If x=1 put in equation we get

(i)3×1+4y=7

⇒3+4y=7

⇒4y=7−3

⇒4y=4

⇒y=1

(1,1)

If x=2 put in equation we get

(i)3×2+4y=7

⇒6+4y=7

⇒4y=7−6

⇒4y=1

⇒y=

4

1

(2,

4

1

)

If x=3 put in equation we get

(iii)3×3+4y=7

⇒9+4y=7

⇒4y=7−9

⇒4y=−2

⇒y=−

4

2

(3,−

4

2

)

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