Answer:
b=d
x=
bStep-by-step explanation:
Any multiple of (-2x+3y=18) would constitute an "other equation" forming a system with an infiinite number of solutions. The reason for that is that the two equations would be "dependent."
On the other hand, looking at the system
<span>-2x+ 3y= 18
</span><span>-2x+ 3y= 19
we see that there is no solution. Why? Because -2x + 3y cannot equal 18 and 19 at the same time. You'd have two non-intersecting, parallel lines.
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Answer:
a) The sample proportion of adults who trust DNA testing is p=0.91.
b) 98% CI: 
We can claim with 98% confidence that the real proportion of adults that trust DNA is between 0.84 and 0.98.
Step-by-step explanation:
a) In this problem, we calculate p-hat, the sample proportion of adults who trust DNA testing, as

b) The z-value for a 98% CI is z=2.326.
The standard deviation of the proportion is:

Then we can define the CI as:

We can claim with 98% confidence that the real proportion of adults that trust DNA testing is between 0.84 and 0.98.