Solve by addition. 4x+6y=9, 8x-3y=-7?

Question

Thanks

Answer 1

Multiply the second equation by 2, then add:

16x - 6y = -14
4x + 6y = 9

20x = -5
x = - 1/4

4(-1/4) + 6y = 9
-1 + 6y = 9
6y = 10
y = 10/6 = 5/3

x = - 1/4 and y = 5/3

that's it!

Answer 2

Dear Ms. Germanmo...

Let us discover the solutions for our variables x and y together.


4x + 6y = 9
M( -1 ) -4x +3y = 7 and adding ---->we find that,
_____________

9y = 16
y = 16/9


4x + 3 ( 16/9 ) = 9
12/3x + 16/3 = 27/3
12/3x = 27/3 - 16/3
M( 3 ) 12x = 27 - 16
x = -5/12


Checking our solutions in our original equations we have:


4( -5/12 ) + 6( 16/9 ) = 9
( -5/3 ) + ( 32/3 ) = 27/3
27/3 = 27/3
9 = 9

and 4( -5/12 ) - 3 ( 16/9 ) = - 7
( -5/3 ) - ( 16/3 ) = - 21/3
- 21/3 = - 21/3
- 7 = - 7


Sincerely,
[e-mail]
(a.k.a. calvaliear)

Answer 3

4x +6y =9...............1
multiply with 2, 8x +12y =18
8x-3y = -7...................2
sub tract.. 15y= 25, y= 25/15=5/3
substitue the value of y= 5/3..in 1
4x + 6*5/3 =9, 4x+ 10=9 , 4x= 9-10 = -1
x= -1/4 , y= 5/3.

Answer 4

Hmm. Trying to be slick, ha? You have several individual questions asking people to do your homework.


I'll pass. If someone would've done my homework, I'd be dummer than a bag of rocks. You need to try harder, take notes and ask questions or even get a tutor. Sometimes it takes several wrong answers to get the correct answer. Don't be afraid to work a problem out for yourself and possibly get it wrong. Hopefully, your teacher will see how you worked the problem out and make corrections to reflect HOW you answer certain problems.

Good luck.

Answer 5

- 8x - 12y = - 18
8x - 3y = - 7--------ADD
-15y = - 25
y = 5/3

4x + 10 = 9
4x = - 1
x = - 1/4

x = - 1/4 , y = 5/3

Answer 6

im no nerd but i think the answers may be 10xy and 5xy