Question

3x +4y = 10 और 2x-2y = 2​

Answer 1

Answer:

Solving 3x + 4y =10 and 2x - 2y =2  by elimination method:

Let 3x + 4y =10    ...(1) and

2x - 2y =2   ...(2)

 

Multiply Equation (2) by 2 to make the coefficients of y equal.

 

Then we get the equation: 4x – 4y = 4   ... (3)                          

Add  Equation (1) and (2) to eliminate y, because the coefficients of y are the same.

So, we get

(3x + 4x) + (4y – 4y) = 10 + 4

7x = 14

x = 2

Substituting this value of x in (1), we get

3x + 4y =10  

3(2) + 4y =10

4y = 4

y = 1

Step-by-step explanation:

Answer 2

3x+4y = 10 ---------- 1

2x-2y = 2   -----------2

Now,

3x = 10-4y

x = 10-4y/3 ----------3

Now, substituting the value of x in eq. 2

2(10-4y/3)-2y = 2

20-8y/3 - 2y = 2

Taking L.C.M

20-8y-6y/3=2

Multiplying 3 on both sides

20-14y = 6

Substracting 20 on both sides

-14y = (-14)

Now, dividing by (-14) on both sides

y = 1 -----------------4

Substituting the value of y in eq. 3

x = 10 - 4(1)/3

x = 10- 4 /3

x = 6/3

x = 2

Ans. x = 2 and y = 1