Question

1. Simplify by combining the like terms:
b) -x to the power 2 + 7x to the power 2 - 3x + 7x to the power 3 - 5 x​

Answer 1

Answer:

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?