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January 31, 2015

January 31, 2015

Posted by **Anonymous** on Monday, January 27, 2014 at 4:40pm.

Solve each system by elimination.

1. 8x+7y=-1

-9x-7y=2

I got (-1,1)

2. 4x+3y=1

-4x-7y=-13

I got (2,-2)

3. -7x-6y=-21

-x-6y=-3

I got (3,0)

4. -2x+3y=-16

-2x-5y=-16

I got (8,0)

5. -7x+2y=13

-14x+4=26

I got (0,0)

6. 15x-8y=14

-5x+9y=8

I got (2,2)

7. x-6y=22

-2x+3y=1

I got (-8,-5)

8. 2x+10y=30

-10x-6y=-18

I got (0,3)

9. -35x-15y=0

56x+24y=0

I got (0,0)

10. -56x+72y=-16

-49x+63y=-14

I need help with this one!!!

- Quick math help -
**Damon**, Monday, January 27, 2014 at 5:16pmYou do not need us to check.

Put your answers back in the original equations.

as for #10

-56x+72y=-16

-49x+63y=-14

divide top by 2

divide second by 7

-7 x + 9 y = -2

-7 x + 9 y = -2

NO solution. This is the same line repeated, no intersection

In linear algebra if one row is identical to or a multiple of another, the determinant of the coefficient matrix is zero and the solution is undefined.

- Quick math help -
**Anonymous**, Monday, January 27, 2014 at 6:14pmCan you check number 5? Is it no solution?

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