Question

for each value of x, determine whether it is a solution to 2x - 7 = -9.
| x | is it a solution?

-1	∘ (yes)	∘ (no)
9	∘ (yes)	∘ (no)
3	∘ (yes)	∘ (no)
-10	∘ (yes)	∘ (no)

Explanation:

Step1: Test x=-1

Substitute x=-1 into 2x-7: $2(-1)-7=-2-7=-9$, which equals the right-hand side. So yes.

Step2: Test x=9

Substitute x=9 into 2x-7: $2(9)-7=18-7=11≠-9$. So no.

Step3: Test x=3

Substitute x=3 into 2x-7: $2(3)-7=6-7=-1≠-9$. So no.

Step4: Test x=-10

Substitute x=-10 into 2x-7: $2(-10)-7=-20-7=-27≠-9$. So no.

Answer:

x=-1: Yes; x=9: No; x=3: No; x=-10: No