Answer:
Step-by-step explanation:
a)
Smallest number of equations required are:

Let equations are

b)
Yes we can add one more equation
c)
We can add infinite such equations so that solution remains same.
d)
General form of such equations are called inconsistent equations
Answer:
when you divide powers with the same base, you can just subtract the exponents
Since both x values are the same and since the y values are 18 digits apart, the distance between both points is 18 units.