Saturday
August 2, 2014

Homework Help: 8th Grade Algebra- Answer Check

Posted by Lily on Wednesday, February 25, 2009 at 8:47pm.

Solve each system of equations, give the solution and state whether there are no solutions or many solutions.

1 )3x + 8y = 1
7x + 4y = 17
Answer: (3,1)

2) -3x + 5y = -7
9x + 2y = 38
Answer: (4,1)

3) 7r + 3s = 13
14r - 15s = -16
Answer: (1,2)

4) 2x - 7y = 42
4x - 14y = 64
Answer: No Solution ??

5) 9x + 12y = 15
3x + 4y = 5
Answer: Identity ??

6) 2 = 4s - 3t
2 = 12s - 9t
Answer: No Solution ??

7) 3a - 6b = 18
4a + 8b = 24
Answer: (6,0)

If I got any of these wrong, can someone please show me the right way to do them?

These I have no idea on how to do them.

8) 4x +8y = 5
5x +10y = 13

9) 13 = 8a - 8b
6 = 4a - 5b

10) 160 = 2x - 10y
120 = 3x - 15y

Can anyone show me how to do these ones, I keep trying to solve them, but keep getting the wrong answer?

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