Question

There is 7 more math problem

1. 2x+ 4y = 10
-4x+ y =-22


2. 5x+y=-12
5x-7y=4


3. 7x+y=10
-7x-10y=26


4. 4x-2y=-14
3x-2y=-14



5. 6x+2y=20
-3x+3y=-30



6. -5x+4y=-3
-9x-y=30




7. -9x+6y=27
-x+3y=10

Answer 1

Explanation:

2x+4y=10

-4x+y=-22

--------------

2(2x+4y)=2(10)

-4x+y=-22

--------------------

4x+8y=20

-4x+y=-22

----------------

9y=-2

y=-2/9

2x+4(-2/9)=10

2x-8/9=10

2x=10+8/9

2x=98/9

x=(98/9)/2

x=(98/9)(1/2)

x=98/18

x=49/9

Answer: x=49/9, y=-2/9. (49/9, -2/9).

Answer 2

Answer: 2x+4y=10

-4x+y=-22

--------------

2(2x+4y)=2(10)

-4x+y=-22

--------------------

4x+8y=20

-4x+y=-22

----------------

9y=-2

y=-2/9

2x+4(-2/9)=10

2x-8/9=10

2x=10+8/9

2x=98/9

x=(98/9)/2

x=(98/9)(1/2)

x=98/18

x=49/9

Answer: x=49/9, y=-2/9. (49/9, -2/9).

Explanation: