Question

i am working on soloving a system of equations though elimination can some one help me??

Answer 1

3. What is a possible first step to eliminate a variable in the following system?

7x - 9y = 2
3x - 6y = -4

Multiply the first equation by 2 and the second equation by -3.
Multiply the first equation by -3 and the second equation by -2.
Multiply the first equation by 7 and the second equation by 3.
Multiply the first equation by -2 and the second equation by 4.

Answer 2

4. Solve 2x + y = 7
x - y = -4

(1, 5)
(-1, 5)
(1, -5)
(-1, -5)

Answer 3

5. Solve x + 2y = 13
4x + 8y = -9

(3, 5)
(-1, 7)
No Solutions
Infinitely Many Solutions

Answer 4

6. Solve 3x - 5y = 17
9x - 15y = -4

(-1, -4)
(4, -1)
No Solutions
Infinitely Many Solutions

Answer 5

7. Solve 5x + 2y = 7
10x + 4y = 14

(1, 1)
(2, negative three halves)
No Solution
Infinitely Many Solutions

Answer 6

8. Solve 7x - 2y = -3
14x + y = 14

(4, five sevenths)
(4, seven fifths)
(five sevenths, 4)
(seven fifths, 4)

Answer 7

http://www.purplemath.com/modules/systlin5.htm

Answer 8

LOL these many questions at once

Answer 9

sorry but thats all

Answer 10

I could definitely help you with this. but it would take too long and I don't have a lot of time right now. sorry

Answer 11

uggg :(

Answer 12

First one if we see the options he is asking about the first step of the solution

Answer 13

Lets verify with the options given and see which one can result us in elimination of a term

Answer 14

okay

Answer 15

I could sense its only the first option which satisfies elimination step so I would go with first one

Answer 16

okay.

Answer 17

42x + y = 7
x - y = -4 Adding these two equations we get
.............................
3x = 3 => x = 1 and now substitute x = 1 in any one of the equation to get y

1 - y = -4 => -y = -4 -1 => -y = -5 => y = 5

Answer 18

so whats the answer?

Answer 19

x + 2y = 13
4x + 8y = -9

Multiply first equation with 4 u get

4x + 8y = 52
4x + 8y = -9

Here both x and y will be eliminated if we subtract these two equations so there are no solutions for this

Answer 20

Hope U can try the other one in same manner

Answer 21

huh?? im lost

Answer 22

For fourth one it is (1,5) and for fifth one Infinite solutions

Answer 23

okay do u kno 678?

Answer 24

6 , 7 also no solutions

Answer 25

8th one u can solve for solutions

Answer 26

Solve 7x - 2y = -3
14x + y = 14

Multiply equation 1 with 2

14x - 4y = -6
14x + y = 14 Subtracting both the equations we get

14x - 4y = -6
-14x -y = - 14
...................................
-5y = -20 => y = 4

Substitute y value in any of the equation 7x - 8 = -3 => 7x = 5 =>x = 5/7

(5/7 , 4) is ur answer

Answer 27

thanks so so much!