Answer:
it's probably ours it's just a lucky guess
Step-by-step explanation:
Answer:

Step-by-step explanation:

Answer:
7. Option D
9. Option B
10. Option C
Step-by-step explanation:
If you were to make both x's equivalent, you'd have to multiply the first equation by 2 to get rid of the coefficient, 1/2. However, you'd have to multiply 2 onto -8 as well, therefore the equation would turn into x - 16 = 18. That is not equivalent to x - 8 = 18.