Question

What is the value of x+y if 2x+y is 7 and 3x+2y is 12 ?​

Answer 1

Answer:

6

Step-by-step explanation:

2x+y = 7  (i)

3x+2y = 12 (ii)

Multiply (i) by 2 and subtract from (ii)

3x+2y = 12

4x+2y =  14

(-)  (-)      (-)

-x= -2

Therefore , x = 2

Substituting the value of x in equation (i)

2*2 + y = 7

y= 4

THEREFORE: x+y=2+4=6

Answer 2

Answer:

x+y=29/7

Step-by-step explanation:

2x+y=7

y=2x-7----------(1)

3x+2y=12

Putting (1) in the following equation

3x+2(2x-7)=12

3x+4x-14=12

7x=12+14

7x=26

x=26/7-----(2)

Putting (2) in (1)

y=2(26/7)-7

y=52/7-7

=52-49/7

y =3/7

therefore x+y=26/7+3/7

=26+3/7

=29/7