Me with these questions about x and y coordinates.

-10

Step-by-step explanation:

You are asked to tell the y-value of the solution. You can find the whole solution and then report the y-value, or you can just find the y part of the solution. We choose the latter.

This is basically done by eliminating the x-variable. It can be done using the "elimination" method of solving these equations. And it can also be done using the "substitution" method of solving these equations. We choose the latter.

Add 14 to the second equation to solve for x:

... x = y + 14

Substitute this into the first equation.

... 3(y +14) -y = 22

... 2y +42 = 22 . . . . . . simplify

... y +21 = 11 . . . . . . . . divide by 2

... y = -10 . . . . . . . . . .  subtract 21

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Comment on additional solution methods

A graphing calculator can show you the solution, as in the attachment. Of the solution (x, y) = (4, -10), we are only interested in y = -10.

Cramer's rule can find just one variable value, too. For that, it is convenient to write the system as ...

Then the solution for y is ...

... y = (22·1 -14·3)/(-1·1 -(-1)·3) = -20/2 = -10

Indonesia has the highest Population Density (1045.7935 people per Km square)

Ghana has the least Population Density (77.20611 people per Kilometre Square)

Step-by-step explanation:

Population density is the per unit value of People living in a particular geographical area to the land mass.

Population density = Total Population / Land mass per square

Indonesia =203,479,000/1,904,569

=1045.7935people per Km square

Denmark= 5,248,000/42,077

=124.7237 people per Kilometre Square

Ghana=18,339,000/237,533

=77.20611 people per Kilometre Square