Question

3х - 4y = 7; 2x+y=12​

Answer 1

Answer:

x = 5 and y = 2

Step-by-step explanation:

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

And 2x + y = 12 - - (2)

Multiply (2) by 4

=> 8x + 4y = 48 - - - - (3)

On adding (3) and (1) we get

=> 11x = 55

=> x = 5

Put this value of x in (2)

=> y + 2(5) = 12

=> y = 12 - 10

=> y =2

Hence, x = 5 and y = 2

Answer 2

Answer:

x=5

y=2

Step-by-step explanation:

Given that,

2x+y=12------------i

3x-y=7 ------------ii

From i we get,

2x+y=12

x=(12-y)/2 ----------iii

From ii we get,

3x-4y=7

3{(12-y)/2}-4y=7

(36-3y)/2-4y=7

(36-3y-8)/2 = 7

36-11y= 14

y = 2

putting the value of y in iii we get,

x=(12-2)/2

x= 5