Quick math help

posted by Anonymous

Can someone please check my math Hw? Thank you!!
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!!!

1. Damon

You do not need us to check.
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.

2. Anonymous

Can you check number 5? Is it no solution?

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