Math help???????????

Question

2x-y=9

x+y=9

is it,

1.x=4,y=5

2.x=9,y=9

3.x=18,y=-9

4.x=6,y=3

Answer 1

This is the way you do it:

2x-y=9

x+y=9

since one equation has -y and the other one has +y, the equations would come too

3x = 18

x = 18/3 = 6

Since X=6  and X+y = 9

y =3

X=6, Y=3 is the answer  

Answer 2

Anwar Bhai! answer is

4. x=6,y=3

Answer 3

Question

Math help???????????

2x-y=9

x+y=9

add

3x=18

x=6

only choice is #4 and it works

is it,

1.x=4,y=5

2.x=9,y=9

3.x=18,y=-9

4.x=6,y=3

Answer 4

you add the two eq

3x = 18

x=6

6+y=9

y = 3

Ans is #4.

Answer 5

2x-y= 9

x+y=9

1) Get one variable by itself; im gonna get 'y' by itself from the second equation.

2) 2x-y= 9

     y= 9-x (subtracted 'x' to get y by itself.

3) Replace the 'y' in the first equation, with the 'y' from the second equation.

2x- (9-x)= 9

4) Distribute

2x-9+x= 9

5) Combine the x's; 3x-9= 9

6) Take the 9 of the left, and add it to the 9 of the right, and you get 18.

3x= 18; divide by 3-----> x= 6

7) Now just replace the 6 into the 'x' of any of the equations.

2(6) -y= 9

12-y= 9



8) Subtract 12 from both sides and you get -y= -3; now get rid of the negative in front of the 'y' and then divide it from the -3 too.

y= 3

So, the answer is 'D'; x= 6, y=3

Good Luck.

Answer 6

4 because if you substitute the other answers in they dont work...

Answer 7

x=6,y=3

how to verify ?

in each of equation try to replace x by 6 and y by 3

e.g. in equation 2

x+y=9

6+3=9. So x=6 and y=3 is corect.

Answer 8

4.

Answer 9

x=6, y=3

2x6=12  -3=9

6+3=9