Water cannot exist in this state.

a. liquid
b. gas
c. solid
d. none of the above

The best and most correct answer among the choices provided by your question is the fourth choice or letter D. Water can exist in all phases of matter. 

In thermodynamics, the triple point of a substance is the temperature and pressure at which the three phases (gas, liquid, and solid) of that substance coexist in thermodynamic equilibrium. Water exists in three distinct phases at something called the triple point.
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The answer is d) none of the above

 water in liquid is well water.
water in gas in called evaporation.
water is able to exist as a solid (ice)
good luck!

It must have the same slope as the given line, so

m = -A/B = -1/-2 = 1/2

So far, we have

y = mx + b = x/2 + b

Use the given point to find b.

4 = -2/2 + b = -1 + b

b = 5

y = x/2 + 5

Multiply through by 2.

2y = x + 10

Standard form:

x - 2y = -10