Is there a ruler tool on that site that you are supposed to use to measure?
Based on your problem, you only have one given. So, you can't make an equation for this because there are not limits to the equation. The only thing that you know is that the three numbers are consecutive even integers. My way of solution for this is trial-and-error. However, it's really quite easy.
For example: 42 + 46 = 88. I have to increase the numbers more to reach 136. Suppose: 82 + 86 = 168. That exceeded 136. So, it must be between 46 and 82. Suppose again: 66 + 70 = 136. Therefore, the sequence of the consecutive even integers are 66, 68, and 70.
The given fuctions are:

this means that for the reference it is:

now for the first coordinate it is:

then:

then:

Finally
C because with square root a negative has to be out side of the boxs
Answer:
blue and green because parallel means two lines that will never cross