The point (2.5, 125) is on the graph but not in the table. the ratio of the y-coordinate to the x-coordinate

see the explanation

Step-by-step explanation:

see the attached figure to better understand the problem

we know that

A relationship between two variables, x, and y, represent a proportional variation if it can be expressed in the form or

In a proportional relationship the constant of proportionality k is equal to the slope m of the line and the line passes through the origin

Let

x -----> the amounts of ammonia in ml

y -----> the amounts of distilled water in ml

In this problem the relationship between variables, x, and y, represent a proportional variation

The constant of proportionality k is equal to

see the table

For x=2, y=100 ---->  

For x=5, y=250 ---->  

The linear equation is equal to

Complete the values in the table

For x=3 ----->

For x=3.5 ----->

For y=200 ---->  ---->

we have the point (2.5,125)

That means ----> There are 2,5 mL of ammonia and 125 mL of distilled water

The ratio of the y-coordinate to the x-coordinate is equal to the constant of proportionality k or slope of the linear equation

so