In a certain desert environment there are a lot of small rodents. There also happens to be many snakes that feed on the rodents. The ratio of rodents to rodent-eating snakes is 13 to 5. If there are 4000 snakes in the area, how many rodents are there?

5k=serpientes

13k=roedores

5k=4000

k=800

13x800=10400

I got 923 rodents.

This is how I solved it:

So, since we're talking ratios, I took snakes eaten divided by # of rodents.

Snakes eaten/# of rodents

13/4,000 = 3/x

Now, you would cross multiply. (This is how I was taught).

13 * x = 13x and 4,000 * 3 = 12,000

Now, your equation should look like this:

13x = 12,000

Now, you would divide 13 and it would look like this:

13x/13 = 12,000/13

You wouldn't divide 13x by 13. It just stays x.

It would be x = your answer

So, 12,000/13 is 923.0769231 but you only round up if the first number after the decimal is 5 or higher. In this case, it just stays 923.

Your final answer would be 923 rodents.

I hope this helps you somewhat.

question is incomplete.

x=-2

infinite number of lines, so there is an infinite number of equations.

step-by-step explanation:

there are an infinite number of line that passes through the point (-2,5)

x=-2   is one line that passes through the point

y = 5 is another line that passes through the point

(these two lines are perpendicular to each other).

since the number of   numbers are infinite and the slope is the ratio of two numbers,(change in y over change in x) we can have an infinite number of slopes.     our only condition is that it passes through the point (-2,5)